MIL living in my inherited home

So almost two years ago my mil moved into my home I inherited when my mom passed. I live in a different home. I was planning on using it as a rental property to make extra income. She is on social security and food stamps and that’s all the income she has so she is only able to cover the bills for the home and we end up paying for a lot of what she can’t afford. At the time, she was staying with other family members and everyone was tired of having her live with them so it was either she go to my inherited house or live with us. The second option is a no. Life is way too short to be stuck living with someone who is the way she is. So now we are financially struggling, my job is seasonal and I am not making money now. My credit cards are going delinquent and my husband just spent the money we got from her for the property tax for the month $500 so now I have to figure out how to make that up. I know we should help care for our parents when they are elderly but why am I feeling like I’m getting screwed over? We now also have to spend over $500 at least to help cover her expenses every month. I know I need to get a better job but I feel so resentful knowing I could be making rental income and I’d be good. Any advice?