Mom betrays my trust

So my mom knows not to touch my baby because of Covid. I’ve only seen my mom a handful of times since March as I’m so paranoid about the virus. As restrictions are easing I’m willing to see them socially distanced in my garden. Today my baby was playing in her paddling pool so my mom came over. I was happy for her to touch a couple of my babies toys but when she thought I wasn’t looking she touched my baby’s hair 🙁 she always try’s to push boundaries. My dad called her out on it. I didn’t say anything as I was just caught by the moment. What shall I do. And what shall I do to ensure it doesn’t happen again.