Depends on what you want. Happy (or at least non-traumatic) memories are, by and large, impossible to tell they belong to the metal-armed dude named Soldat, cuz they're all about a two-armed dude named Bucky (though I am of course willing to do that, it'd just be something of a scavenger hunt to find out if belongs to him XD ).

If you want something clearly related to the guy she knows, it'll be something related to torture, killing, or really rigorous training.