Problems with my soon to be mother in law.

I just need to vent and maybe get some advice. WARNING THIS WILL BE SUPER LONG! Me and my fiancé have been living together for the past year and 7 months. We used to live with roommates but for the last 6 months we have been living at his mothers because it was easier on us financially, she needed help with bills, she's getting older (65) , We have a baby on the way, and it's what he wanted to do. I'm currently 27 weeks pregnant and I'm still working my management job but not working full time anymore just part time. Over the last six months since we moved into her house i have been pushed to my limit with what I can take from someone. She is just plain rude to me all the time. If he's around she talks about me as if I'm not even there and asks questions like "does your girlfriend mind changing the channel " or "can you ask your girlfriend to clean the house " instead of just asking me. She stands over me while I do anything. If I'm washing dishes she will stand in the kitchen and ask me questions like "why do you use that soap", "you do you wash the cups first" , "why do you use sponges", "why do you stack the dishes that way". If I'm doing laundry she will stand there and ask me a million questions and then when my clothes are done drying she will dump them on the floor before I can even get my basket to get them out. (Our laundry room is semi outdoors) if I'm watching TV with my fiancé she will complain about what we are watching he entire time it's on until we just give her the remote and leave the room and then she will continue watching the same show. We left our bank card on the table in the entry way and she drained out bank account and said we owed her hat money and then when we told her that was all our money for the week she still refused to give any of it back. If her and my fiancé are having a dispute about something like his shoes being left on the living room floor she will randomly start calling me names like "lazy bitch" and ask him why he puts up with me. (I'm far from lazy I clean every day that I'm off work, I do our laundry , I wash the dishes I basically do everything except cook every night) if you try to bring anything that she does that's wrong or rude to her attentions she will start breaking things and use that she's going to turn the power off and the internet. I sleep naked because my clothes get super uncomfortable at night since I've started getting further into my pregnancy and she literally just walks in our room as she pleases just to ask us what we're doing and why we don't wanna be around her. If I get up and walk out of a room to go pee or anything she gets pissed and says I make her uncomfortable in her own home because I leave every room she's in. She will leave food on the counters for days and when I clean it up she gets mad at me and yells at me saying i shouldn't have because its still good. I try to go to my fiancé about these problems and he says he knows and understands but it's how his mom is. I'm on the verge of leaving him just to get away from her.