My mother in law

Mother in law invited herself to come stay with us once I deliver in order to “help”. I don’t want anyone here with a new born as I try to recover from c section. She is so pushy. How do I get out of it. She is also trying to bring her husband and eldest son with her. As if I need to accommodate people in that condition. I’ll feel so uncomfortable to come out of my own bedroom if I have people over that first month. What the hell. How do I say no without sounding mean?