How to talk to my mother-in-law?

If possible start with niceness '(her name), we need to talk. I understand that you like to go, go, go but (child's name) is just not used to that level of activity. She is used to her normal routine. I can help you find ways to spend time with her that fit into her routine if you would like me to.' If that doesn't work you're going to have to take more drastic measures. For me and my mil it would go something like 'I don't care if you own this house or not it is my home and you need to find some where else to stay. Here's a list of local hotels and their rates. Are you going to pack or would you like me to do it for you?' Actually with the history between my mil and I this situation would never happen, she is not welcome at my home for any reason. I hope you can work something out before it gets any worse.