How do we survive this?

I had a c-section almost 2 wks ago, so coupled with recovering from major surgery I also have new baby at home. I am severely sleep deprived, have baby blues & my mother-in-law saw it fit to show up here every day. Today, when we got home she was here again, waiting for us and apparently I was a bit short with her, now she says I've been like that every day since the baby was born and she'll never set foot in my house again. Well, what did she expect? She shows up here whenever she likes and interrupts whatever sleep I may get. Will you be all perky and friendly with only 2hrs a night for 2 wks? On top of it all, she questions my judgment with the baby and makes me feel like a bad mother, so really I don't care that she's gone... but my husband is livid and is taking her side. We had a bad fight today, so much so that I wanted to take my child and leave. I don't think we can survive her onslaught. She just doesn't respect our boundaries. Pls, I really need help. My family won't make it