MIL moving in!!!

My MIL is moving in next week so trying to find energy to get her room done. I love her to dealth but she is like having another child. how do I stay sane? when she cleans I feel like I should be up cleaning but I know I will just want to lay there I have my days I do my cleaning and touch up Dailey when kids are at school. I know she will want to cool as well but my kitchen is my space my husband dosnt even touch my pans lol he has his own set. sorry just a rant but any tips to stay sane and not worry if she is judging me for being lazy during certain hours!!!