Infant bedtime nightmares / strained relationship

Nia

For the past month my 1yr old has been going to sleep past 1am. And I’ve been stressed/ losing sleep its also been impacting my partner and I relationship. (My partner and I have been not really getting along for a while) My partner would give up telling me he is sleeping either way because of work in the morning. Its really frustrating because I then wake up super late because how little sleep I get from doing this alone. This routine is exhausting. Especially with a toxic partner. But in desperation, I had left my partner alone in our apartment to get away, to have space. He was being aggressive so I took my baby with me to my great grandmothers home December 23-29. Since those days of being at my grandmothers my 1yr old sleep has improved drastically. She would wake up early in the morning, take two naps and then have her bedtime around 11pm. Now that we had came back home, my baby instantly went back to how it normally has been by sleeping super late past 1am! I dont know what to do. Im losing my mind and patience. Its making me think that maybe I should just live alone with her, without her dad. Living with her dad(my partner) has been very difficult /stressful on my mental health. Im wondering if it could be affecting her. Im worried