Don't know, but she pretends she is RV at some point in the conversation they have in the loggia after the shooting (18:30 and after). She also says her real (1st name) is Christina. Maybe a tattoo check ?
Seems to me she told about it in one conversation in the loggia, maybe this one (no time to listen again, sorry):
Oliver – Loggia camera Voyeur House TV (cam110)
VOYEUR-HOUSE.TV
Watch Loggia camera in private voyeur show of Oliver at Voyeur House TV