I asked my MIL to move into my house and now I want her to o

Okay I don't know if anyone will message on here or not but I don't know what else to do. My husband and I bought a house last September and we had my mother in law move in with us. She was living with her sister and she kept telling us that her sister was going to have to move in December and my MIL would be homeless so we had her move into our new house with us. For one thing her sister ended up renewing her lease for a year and potentially for the rest of their lives. Needless to say my MIL just wanted out of that house and into ours. She's very nice and never says a mean word or anything like that, but she has a very dominant personality. It feels like this is her house and my husband and I are just kids in it. We tried to have a talk with her abut 4 months ago about this is our house. We can come and go as we please. We want 5o decorate it the way we want, etc. She blew up crying while running out of the house and than she didn't want to talk about it again. End of story. It's my husband's mom and he won't say anything either. I feel like it isn't my house, I have no privacy, she runs stuff. My marriage is failing because of the family dynamics. When my step son is here she does what she wants with him. I don't feel like a wife or mother. Just a child. I want my own house decorated the way I want and just to be able to do what I want. I don't know what to do. Talking to her doesn't work, but my husband seems to care about her feelings and not mine. Am I wrong to feel thus way about my MIL living with me? She's not mean, but controlling and she's a mother figure. What can I do? I suffer from PTSD from the military and I'm so depressed and angry everyday over this situation. The worse is she is 74 and very healthy and able so thinking about her living in my house for 10 or 20 years kills me. She can't afford her own place because she's on social security and she's told other family members she won't move back in with her sister who offered her a room in their house where she was staying prior to moving into my house. Please anybody help. I have no one to talk to and never been in this situation. I feel helpless because my hubby feels he owes her and doesn't want to talk about it and idk how to approach it myself. Mind you I pay the mortgage and all the bills so really it's my house.