Relationship with her gives me stress.

In the classroom there’s a lead teacher and assistant teacher. I am the assistant and my co teacher is the lead. My job is to maintain order in the classroom while she gives lessons and to clean up to room. I clean every day and sometimes when the kids were occupied I would clean during the school day. She asked me to stop cleaning during the school day yo focus on the kids. So that’s what I did. Then she now tells me the room is not clean enough. Yet when I try to keep it clean throughout the day she complains and when I do it after the kids leave she still complains it’s not done well enough! She’s so nit picky. I told her this week the classroom didn’t look so perfect because I was asked by the principal to work the after school program as someone called out and didn’t have any time to clean after school. Then she said “oh you think they would’ve told me there’s such bad communication at this place”. (Does that sound like she complained about me to them?) She really bothers me and is not a positive person to be around at all yet I love the job and everyone else who works there. The last assistant only lasted a year with her there. She want’s everything to be perfect when that’s not reality. She also sometimes tells me about problems she has at home so maybe that has something to do with it but I don’t know. She also tells me this little girl is manipulating me when I don’t see that I have a close relationship with this kid and I sometimes wonder if she’s trying to turn me against the kids or something cause they all love me and she yells at them all. My relationship with her gives me stress. What should I do?