I think Black Widow would've made sure the little girl thought it was a game and paid her or something, though. With that level of trauma, it would be that or mirror her experiences by trying to kidnap the kid for SHIELD, and given what happens in Birthday Girl, I think she might have gone to the 'THIS CHILD WILL BE HAPPY' extreme instead of the 'SHE MUST GROW AS A SPY AS I DID FOR HER OWN GOOD' end.