Anonymous wrote:She's doing this for experience. If you're really unwilling to work with her, talk with MB.
Would you be willing to meet in the middle? Have her come over less?
If you are willing to give it at least a trial run: teach her.
The bottles: show her how you warm them. The microwave is bad because it creates hot spots in the milk and breaks down nutrients.
Not sure what you mean by too rough with them -- they're a year, they can handle a little rough play time.
Bring her with you to the playground. Let her slide down the slides holding the kids one by one.
Let her help folding laundry
Let her play peek a boo or sing songs to them.
Let her read stories.
It's not OP's job to teach her these things or to give her tasks to occupy her time while she is there. If MB wants a mother's helper, she should be responsible for training her. When OP has three children to worry about, she does not need to spend time thinking about one more.