pt.6 Alastor possible involvment in the situation could explain why she seems to really care for him, and I wouldn't put it past Alastor since (from my understanding) he seemed to have a strong hatred for man in power during his life and those kind of people may have been his primary targets.

pt. 5.5 (?) what I mean with this is the fact that s.a. survivor often feel "filthy" during and after their experience. It's not strange to associate aggressors with beasts and/or disgusting things (as bugs or any "filthy" animal).

pt.5 She seems particularly violent towards insects, rats and roaches... which she could involuntarily associate to the idea of her aggressor/s. She also seems to hate men that abuse others, like Valentino.

pt.4 Whichever case, if the police got involved with the incident they probably didn't believe her... she was seen as an "hysteric woman", dismissing her. Being a victim of abuse could also explain why she is obsessed with keeping everything clean and with "bad boys".

pt.3 Have you ever noticed how Nifty seems to be scared of cameras? She freezes in front of them completely. I fear that a wealthy man she worked for abused of her body while filming the sexual abuse on a camera. I'm not sure if she killed the man herself or if Alastor maybe did.

pt.2 Being of japanese ethinicy during that time period came with heavy discrimination in the us, since ww2 ended recently and many jp people were imprisioned in "work camps" (COFF COFF concentration camps) by the US during the war.

So, here's my theory [again, TW for: S.A. , racism and misogyny]
pt1.
So... what we know for sure is that she had died in the 50' and was a japanese american.
My assumption is that she was a young japanese-american woman that worked as a maid for wealthy people.
[continues in pt.2]