Living with MIL I can’t take it anymore

Hello Reddit,
I am currently living with MIL because my husband and I lost our jobs. We’re likely going to start jobs by the beginning of September and are trying to move out by early November. We have been living with my in laws since the beginning of the year, very recently like within the last 2 weeks my MIL has changed her behavior towards me. We used to get along but now she is not smiling at me, not acknowledging me when I look at her and talk to her but also constantly staring at my body? It’s very strange. I’ve been on a diet for a couple weeks and this seems to have lined up to when she started treating me differently. I told her I was on a diet in casual conversation and she asked me what I was eating and I told her (more protein, whole foods and no processed stuff) She’s constantly staring at my stomach my chest and basically anything below my face. In the past even before this she has made several comments about my body specifically about my breast size which is on the bigger side. I’ve tried to talk to her about my progress and how I’ve been exercising and losing some lbs and normally I feel like she would be happy for me but as I said she hasn’t smiled at me in days. It’s really making me question myself as to what I did. She has made several comments on what I’m eating one day I had a hamburger with no bun and put some mayo on it a small amount and she said “wooooow look at all that mayo!” Another day I brought home donuts because she asked me to and when I got home she stared at my stomach and asked me if I ate 3. But then she’ll switch it up on me and last night for dinner we had chicken and veggie and buttered noodles and I didn’t have any noodles and she said “you’re missing out on the best part” she also was the only one with tomatoes on her plate and still singled me out and said “what you can’t have tomatoes on your diet either?” As im typing this out it sounds like I could be overreacting but her demeanor has completely shifted towards me. She’s normally very nice and shows interest in me and my life and that has completely gone away in a matter of the last 2 weeks. I’m so confused. Context of my MIL: unfortunately she is a diagnosed narci***** so there is really no resolution here. She does not handle confrontation well at all and will give the silent treatment for days if you upset her. She also has openly admitted that she over exercises and under eats purposely. She is already very small and is active for her age (65) but does not look “fit” just thin. I really would love an opinion on why she is treating me this way. Im feeling very uncomfortable in the house now and I think it’s showing. Im not talking to them as much and im staying on our side of the house more. I’ve been practing emotional detachment the past few days but if anyone has any advice I would appreciate it. Thank you.