William Hill cut her from 40-1 through 33s and 20s, while Coral reported that they were "inundated with bets" at 25-1.
The filly had apparently been the subject of a strong message from one of Britain's foremost tipping services.
"Bar Killer Instinct, this is the biggest gamble on a two-year-old so far this year," Simon Clare, of Coral, reported. "The influence of tipping services is growing by the day, and after Gaelic Storm and Decorated Hero, this is another example of the huge impact they are having on ante-post markets."Reuse content