In my space

I just recently moved into a new place. When my mom comes to visit she always uses my master bathroom. There is a perfectly nice guest bathroom by the two guest bedroom and my office but she is always in mine. The shower in mine is a huge walk in number with jets everywhere so I can see why she likes it, but she brings all her stuff in here and then I can’t even get into my own bathroom. The other bathroom has a shower tub combo, which she won’t use. My younger sister now does the same thing, thinking it’s ok. My mom helped me co sign for this place, so I hate to ask her to stay out of it, but I can’t have any space that’s just mine when she does this. Her hair products, clothes, etc. end up all over my bathroom. Is there a polite way I can ask her to use the other bathroom?

She also turns the AC down to like 65 when she’s here. I can’t afford that kind of electrical bill and honestly it makes me freeze to death. She has hot flashes and so she thinks it needs to be cooler inside. I like it about 75-78. It saves me on electricity and it’s a comfortable temperature for me. How can I address this? She acts like it’s her house and it’s driving me insane. She had the audacity to tell me I have too many clothes. I haven’t grown in ten years. Yes, I have a lot of clothes, but I wear them, and why would I get rid of them if I wear them??