Sorry for not getting back yesterday! It was a bit of a crazy day for me.
Hrm, I don't have anything specific in mind either... Let's see what we've got: Kisha is apparently Maru's cousin, though their parents were close as Maru's family was anti-mob and Kish's dad was involved. Kish and Maru were close though- so they might have been known through that.
It wouldn't be a stretch to assume that Roman knew of Kostya's (her brother) double dealing with the Italian's. He's really not fond of betrayl, right? There could be something there...
Annnd they are pretty close in age so they probably went to school together.