What would you do?

What would you do in my situation? My mom has been watching my 10 month old for 2 hours on Fridays since January while I go to cl. They haven't had any problems and she loves playing with my baby, but I worry about leaving him with her. Growing up she was abusive to me when I misbehaved, threatening to cut herself, to leave, kicking, and strangling me. I know it sounds like a no brainer, but should I leave my son with her for these couple of hours every week? The black and white answer would be 'no', but what would you do, and why? Thanks!