MIL issues

I need some advice my mil has treated me so poorly since I had my baby 2 weeks ago. I posted a post on Facebook before my daughter was here asking no one kiss her because I want to keep her as healthy as possible & when she came to visit the day she was born she kissed her in the face then 3 days later did it again. I didn’t see her do it the second time my husband ended up telling me out of guilt of him knowing and not me. I texted her and told her that it hurt my feelings she didn’t respect my wishes and that I couldn’t trust her now. She doesn’t see how she’s wrong at all and says I’m over reacting. It’s so hurtful because she’s my daughter and I want to feel like as her mother I can make decisions like that without being told I’m wrong. I just want to keep my baby safe is that so wrong? I haven’t made exclusions for anyone so I’m not sure why she feels it’s so personal.