How can I get my mother to watch my babies so I can get out of the house?

I need to get out of the house sometimes just to have a break for my own mental health. I need her to watch them more so I can use my feeding pump and store milk and look for a job so I can get out of her house. Most of the time she says she has to go to a dance cl at the senior citizens center or else she goes on dates with all these old men that take her to dances for old people. In between all her dance sessions, she gripes and bitches about my kids being in her house and how they are always getting in her stuff but she leaves her door wide open so my babies keep going in her room. I try to shut the door as often as I can but sometimes it is impossible to get to it fast enough because I am feeding a newborn. I have a new electric pump from Wic and I need some time to pump milk and store it and look for a job. Most of the time if she is here she says she has to clean her dresser off and then she just stays in her room all day long while I clean the entire house all day long. When she is not dancing, she says that she needs me to help her pay her bills online since she doesn't know how and constantly asks me how we are going to pay all these bills. I am married to a guy that is not very helpful at all and basically all I want is to find a job and a way to go to work and get us out of this mess. Please help!