So I need some feedback!!

My daughter and I live in an apartment with my mom and sister because I just recently became a single mom. I am on the lease with my mom and pay my portion of rent, but the plan has always been to move out when our lease is up in October. Well, my mom mentioned us staying until February because it would be a good idea for us both financially... which I agreed to at the time (but haven’t signed anymore paperwork).

Well it’s become extremely toxic here. I’m 26 and my mom constantly questions my parenting, comments on things I “should be doing” with my daughter, she has belittled me in front of the baby, she’s constantly checking in when the baby and I are gone, she and my sister constantly fight, and I found out she has been looking at some of my mail and is always talking shit about me to all of my siblings. I clean here everyday, work full time, pay for storage my rent and our cable/ Wi-Fi. It’s become exhausting!!

So I told her I think it’s best for my daughter and I to still get our own place in October. She told me the ONLY way I could do that, is if I loan her $1,200 so she can have a down payment for somewhere else. She knows I could use that money! I have debts and need that money but I feel so backed up against a corner because I don’t want to screw her. My biggest complaint is she could easily save $1200 before October— she just bought her third (over $80 bed set), some furniture, fast food, and a new iPhone.

I am so pissed and don’t know what to do. Any thoughts/advice???