S.R.
My MIL stayed with us, and it wasn't that fun. I wanted help getting food and laundry done, she wanted to "teach" me how to care for the baby. She ended up feeling unnecessary and left after 4 days. I was 35 and didn't want that kind of help so I was glad to have her go! My husband, her son, felt bad. I told him to do what he wanted (basically, you deal with it!) so he talked her into staying a day or 2 more. I guess speak frankly with her about the doubts. And tell her what kind of help you "think" you'll want. You won't know until then anyway. The best help a helper gives a new mom is whatever she needs, which takes an intuitive, unselfish person. My sister would have been the one I'd have picked. With my 3rd child she came. She made me tea or kept water at my side always, fed us all healthy food, talked to my husband and kept he and the other 2 cared for. I cried when she left!!!