6 month old hates grandma!

My parents watch my daughter about 1-2 times a month. The past month my daughter screams and cries whenever my mom holds her or gets too close. She’s fine with my dad. This has made my mom standoffish and she doesn’t want to be near my daughter. I’m at a loss at what to do because my parents are our only babysitters and I’d like to leave my 6 month old with them for a few hours once a month, but I don’t feel comfortable doing so when my daughter screams when she sees my mom. Help!