1988: two-year-old season

Petite Ile was ridden in all of her European races by the Australian jockey Ron Quinton. he made her debut in a maiden race over seven furlongs at Phoenix Park Racecourse in October in which she started at odds of 13/2 and finished second to the Dermot Weld-trained Topper Up. Later that month she started favourite against twenty opponents for a minor race at Leopardstown and recorded her first success, taking the lead a furlong out and winning by one and a half lengths.^[4]

1989: three-year-old season

Petite Ile did not run as a three-year-old until 13 May when she finished third to Blasted Heath in a Listed race at Leopardstown. Two weeks later she was tested against male opposition in the Gallinule Stakes and finished third again, beaten one and a half lengths and a length by Porter Rhodes and the Derrinstown Stud Derby Trial winner Phantom Breeze. In June the filly was stepped up in distance for the Listed Oaks Trial over eleven furlong at Phoenix Park. Starting the 2/1 second choice in a seven-runner field she stayed on strongly in the last quarter mile and won by a head from Kostroma.^[5]

For the remainder of 1989, Petite Ile was campaigned exclusively in Group One races, starting with the Irish Oaks at the Curragh in July. Starting at 14/1 in a five-runner field she made steady progress in the straight to finish third behind Alydaress and The Oaks winner Aliysa, beaten less than a length. In August she was sent to England for the Yorkshire Oaks but looked somewhat outpaced on the good to firm ground and finished third for the fourth time in five races as she came home a length and a half and a head behind Roseate Tern and Alydaress.

The ground was much softer when Petite Ile took on nine opponents in the Irish St Leger over fourteen furlong at the Curragh on 23 September. She was made the 3/1 favourite ahead of Phantom Breeze and the British challengers Lazaz (second in the Ormonde Stakes) and Daarkom (Ebor Handicap). The field was not a strong one: apart from Phantom Breeze the only Group race winner in the line-up was Beyond The Lake who started a 20/1 outsider despite his success in the Royal Whip Stakes. Petite Ile was restrained by Quinton in the early stages and turned into the straight in fifth place behind the Upper Strata. First Lazaz, and then Tyrone Bridge went to the front in the straight but the favourite made "smooth progress" to join Tyrone Bridge inside the final furlong. The pair drew away from their rivals in a strongly contested finish, with Petite Ile prevailing by a short head.^[6]

Petite Ile was put up for auction at Tattersalls in December 1989 but failed to reach her reserve price and remained in Malle's ownership.^[7]

1990: four-year-old season

For the 1990 season Petite Ile was sent to race in North America was she was trained by Eddie Gregson and ridden in most of her races by Corey Black. Although Gregson was based in Southern California, the filly did most of her racing at Golden Gate Fields near San Francisco, which involved a nine-hour journey. Gregson reported that the filly adapted unusually quickly to American racing.^[7]

She began her third campaign by finishing second to Sweet Roberta in the Grade III Countess Fager Handicap over nine furlongs on 22 April. Two weeks later she recorded her first win in the United States when she won the ungraded Yerba Buena Handicap from Double Wedge (Gamely Stakes) and Brown Bess (1989 American Champion Female Turf Horse). On 16 June Petite Ile was matched against male opposition in the Grade II Golden Gate Handicap and won again, beating the French import Valdali into second place with Pleasant Variety in third.^[8] Gregson said that the winner was "some filly" but also explained that she could be temperamental, commenting "She'll bite the hell out of you. She takes her pet nips, and she's gotten me and just about everybody else in the barn".^[7] In July the filly moved south and again took on male opponents when she contested the Grade II Sunset Handicap over one and a half miles at Hollywood Park Racetrack. She recorded her third consecutive win as she led from the start and came home half a length in front of the Hollywood Derby winner Live The Dream. After the race Corey Black explained "she jumped well and then she was just loafing out there. She had her ears pricked all the way. I started picking it up about the half-mile pole and she got into the bit when she felt Live The Dream coming up from behind. When I chirped to her in the middle of the turn, she sailed on away. I thought she would win by three or four, but Live The Dream held on tough. She really ran great".^[9]

After a break of over three months, due to a leg injury sustained in the Sunset, Petite Ile returned in the Yellow Ribbon Stakes at Santa Anita Park on 4 November. She took the lead on the far turn but was overtaken in the closing stages and was beaten a length into second place by the 56/1 outsider Plenty of Grace. Both Black and Gregson admitted that the filly had been taken to the front sooner than intended to avoid "traffic problems".^[10] Petite Ile ended her racing career in the Japan Cup at Tokyo Racecourse on 24 November 1990. She reached the final turn in third place but dropped back in the straight and finished twelfth of the fifteen runners behind the Australian Better Loosen Up.^[11] Before the race she had been acquired by the Japanese owner Yoshio Asakawa.

Petite Ile was widely expected to be named American Champion Female Turf Horse at the Eclipse Awards for 1990 but lost out to Laugh and Be Merry despite receiving more votes. According to the Daily Racing Form the result was due to a quirk of the bloc voting system which had produced "the worst of all scenarios".^[12]