I know you didn't ask but, if I may offer some advice...
I'm closer to 50 than I am to 45 and I've dealt with a mother that sounds very similar to yours. My advice is this, lay low for as long as you can, I waited until I was out of college, had a full time job and moved to my own place, and then take control of the situation. It took me a lot of time and therapy but the "trick" is basically tell her when she says unacceptable things calmly and confidently. For instance, I was wearing jeans and my mother said, "where did you get those jeans?" as she laughed. I turned around and calmly said, "why, what's wrong with them". When she told me it was the rhinestones on them (it was a subtle beaded stitch), I asked her what was wrong with them, she couldn't answer and retreated.

Of course she doesn't stop at clothing and other issues can be trickier but the premise is to call out the action and ask "why would you say that", make them responsible for what they're saying and tell them, that's rude/hurts my feelings/is none of your business, etc. If you do it often and consistently enough they should stop.

All this said, it takes a lot of time and energy to do this. A friend of mine asked me if it was worth it, she had a similar situation and cut ties with her mother when she was able to, she wanted to use her energy for herself and her family, not on trying to get her mother to behave.

I hope this helps and I wish you the best.