Abort!!!
I have a mother in law like that, they only get worse I found.
Having a babies a huge job in itself without being judged for it or what your doing!
I lasted 3 months with my mother in law, who worked full-time, but she still has to do everything for her little boy. If she visits us now she'll wash dishes, mop floors and put washing away.
It's not that I don't like the help it's they way she does it, now I hide the washing if she turns up.
The best advice I can give is to break way and get out!
Hope all goes well!