MIL visiting us and our newborn

My partners parents live on the other side of the country so they flew out to us to finally meet their grandchild. Before they came out here we gave our boundaries if no kissing our baby, they’re too young and you guys are traveling we just don’t want that to become an issue. There was hesitation but she finally agreed to respect our wishes. two days after them being there, i slept in so my partner and MIL had the baby in the living room.
She was holding him nothing out of the ordinary. My partner had left the room to go outside and i was finally coming. Out to join them in the living room. As i open my bedroom door i catch her kissing my son on the face. She wasn’t expecting me to come out and she waiting for my partner to leave the room.
She claims she didn’t know she did it to my partner but she admitted it to me so who knows.

She then gets sick the next day so I’m like absolutely no holding the baby. She’s just very possessive.. ( don’t get me started on her relationship with her son .. my partner )
she’s trying to give me advice about what SHEdid and I’m like thank you but no thank you. Today i took my son in my bedroom to breast feed him. We have a monitor over his bassinet but your can see the whole bedroom is you adjust the view. ( the view is always pointed to the bassinet) . I caught her changing the view of the camera to point to me on my bed breastfeeding my son!!
Like what the heck. Invasion of privacy.. there’s absolutely zero reason for her to touch our monitor.. I’m just so sick of them being here. I could explode.

Thanks for reading.