MIL making my life miserable

We are currently living with my MIL. It was originally just my husband but me and him decided to work things out and she allowed us to all move in. I made some bad financial choices behind my husband's back and our house got foreclosed. It's why we separated. But we are working things out. I'm taking responsibility and unfortunately have to stop being a sahm because we can not afford it. I don't like living with my MIL because she's so stuck in what she wants and it's my way or the high way with her. She is much older. She had my husband in her mid 40's. He's 36 so she's in her 80's. He was also her only child. She isn't used to caring for multiple kids so our kids overwhelm her. They're 8, 5, and 2. She wants it to be quiet all the time in her house which isn't realistic for young kids. She also demands we eat dinner at 4, and lights out at 7. That includes me and my husband. She says she's a light sleeper so lights are out for me and my husband too. I just hate that I'm being treated like a child when I'm a grown woman. My MIL also keeps it so hot in the house. It's summer! We have to have fans in our room! I'm just so damn miserable here