Ridden with anxiety babysitter

I have ring nanny cams and I have an amazing sitter on paper for my 5 month old. She’s going to school to be a PA and will be working in the maternity ward because she wants to work in pediatrics. She has another job part time making 22 an hour but was willing to watch my son for 15/hr 2 days a week. I just don’t personally know her super super well. I used to work with her at my old job and she was nice but we weren’t super close. Over time we got to know each other better but I’m ridden with anxiety she will fly off the handle and shake the baby and his mental state will be compromised forever. I have to work as I am the breadwinner of the family. Any advice? Is this crazy mom anxiety? What should I do? She’s watching my son at my house starting in august. Please help!