I need advice…back story. I’ve been with my husband for eight years been married for almost two years. I have an eight-year-old from a previous relationship; her stepdad came into her life when she was eight months and has been like a dad to her when her dad wasn’t around. After we got married in 2019, we got an apartment, and both had jobs at my dad’s company that went down the drain after the virus got bad, so we didn’t have a job anymore, and we had to make a plan to either move 3 hours away from our family or move in with his mom and stepdad. We decided to move in with his mom and fix up their extra part of the house, which was a disgusting mess… We finally got done a couple of months after our lease was up and moved right in. Well, my daughter has called his mom grandma Laura until her sister came along, and she calls her grandma, so now my oldest does as well. His mom treats her completely different than her “actual” granddaughter, and the reason I say this is because no matter what my daughter does, no matter how much my daughter wants to tell her about her day, she acts as if she’s annoyed and doesn’t want to have anything to do with her…she goes to the fridge and gets ice and got In trouble for using it the wrong way, she got a cup out of the cabinet the other day, and I watched and his mom rolled her eyes and shook her head at my daughter and mumbled to herself “I need to buy plastic cups” meaning she doesn’t want her using her yard sale cups 
the way she talks to my daughter bothers me, but I don’t want to cause anything while I’m living here…we are saving up to buy a house, but it’s so hard when we literally pay for EVERYTHING for his mom. She always needs something, and I’ve sat him down and talked to him about it, but he said he’s fine with it. I’ve talked to him about my daughter how much she treats her differently than our youngest… he’s mentioned things to her, but she has an excuse for literally EVERYTHING! It’s like she hates being around my daughter and loves to be around my youngest, and my daughter can definitely see the difference, and it hurts me so bad…and I’m not sure what to do anymore…I feel like I should sit down and talk to her…but I know she will lie or make up some excuse. We are supposed to move out next year, but I can’t keep putting up with this. Also, when I’m disciplining her, she chimes in, and I always have to say I got it, and she wants to continue… I’m at a dead-end road. I’ve become so depressed, I’ve had anxiety attacks, and I know it’s because I am not happy here, and I have nowhere else to go. Please be kind. I’m having such a hard time here…