Your feelings are valid, no doubt about it, and you are obviously a very independent woman. But I have to maintain the view that the care of your children is really the most important thing and you aren't concerned about that as you do trust her in that regard.
I can guarantee I would be tidying my house floor to ceiling if MIL came to babysit, but the care of (future) baby would be what I was most concerned about & I would weigh up whether the other stuff was a show stopper or not. You may reach the conclusion that it is. Just trying to offer perspective.