In law problems

So I am conflicted on letting my son be with my mother in law alone .. I know it’s best for him to be with his grandparents but here are my reasonings..she’s disrespected me so many times but I know my relationship with her does not affect the relationship my son has with her and I want him to have both sides of family in his life well my husband is deployed so when it comes to his family gatherings I always bring my son around for him .. I get bad anxiety each time but I try to do what’s best for my baby

1. I used to send my MIL videos and photos of my son when he reached a milestone or did anything cute , she would never respond so I eventually stopped

2. She came down to visit my son when he was 3 months and I left them alone for about three hours . I go to pick him up and he was alone in the room with the door closed face down and red trying to lift his head up but struggling . She was in the living room watching tv

3. My husband went through some stuff with a babysitter that was his moms best friend . At the time . My husband didn’t tell his mom until years later about what happened and I look and his mom is still friends on Facebook with this woman and I’m disgusted and want to puke i feel like if u fail to do what’s right for your own kid what makes mine any different idk what to do