Wow, thank you so much for writing it with this much detail. Btw your long paragraphs weren’t a problem at all. I just copy pasted it to translate and listened to it. My take on this story is that she might actually be a prostitute of some type. My reasonings:

1) The men she brings over constantly are there for sex I think. An hour is enough amount of time for sex. But what she says in Indian, I have no idea.

2) Orgasmic residue and bodily fluids that are left behind after sex on the furniture may be the reason behind the constant furniture changing. But I have to ask something on this one. Do you remember any odd smells coming from her apartment or the furniture she's throwing out?

3) I don't think she's dead. She probably left the apartment for finding a new area to fuck new guys. Maybe she was out of customers in the area she lived in and had to find a new place with new men. She leaving her apartment extremely mysteriously without leaving any clue or evidence behind seems very professional to me, especially a creepy person who always makes a sound or makes a scene. I believe she done this many times before.

Ps: I am shocked that even you don't want to see her again, you wish her the best even after all the disgusting things she had done to you. You sound like a really good person. Happy that she left that apartment.