I don’t think there’s much you can do tbh. You’ve said what you’re happy with and what you’re not happy with, not sure what more you can do. Maybe next time she asks if you’re taking your baby to the hospital just say, no but we will come and see you when you’re back at home so let me know when you’re back and we’ll come round. I’m sure you’ve done that though. Just let her get on with it
There’s usually rules on taking children into hospital too for visits. It’s often over 12yo only x
Stick to your boundaries :). MiL can see baby when she’s home in a better environment for baby to play. Youre doing great x