U.
My grandmother favored my brother and hated me since the day I was born. It didn't help me that she lived with us and cared for us. Er... she kept us alive and loved my brother. Anyway, I always blamed my mom, not her. My mom was supposed to defend me. SHe did tell her mom to be nicer to me, but there were no DIRE concequences for my gma so she never bothered to change. Every now and then my mom would have a stern talk with her but I always felt like my mom should have put me first above any kind of conflict with her mom. My mom was the only person in the world who could have saved me from that hell and she didn't. She only tried in ways that felt safe to her, but that did not make me safe. The person who suffered (besides me) was her because I ended up blaming and hating her for many many many years. It is only in the last 2 (and I am in my mid thirties) that I've been able to let it go and release all that anger. Don't set yourself up for that. Protect your daughter or risk losing her trust.
Good luck.