My MIL is a very finicky person and she likes to keep things in order in her own home. But as soon as she comes over to our place, no matter how clean it is, she manages to find fault! How do I tell her, she needs to STOP, without sounding rude or crazy!

i would suggest that u turn a deaf ear to what ur mil says. when my mil finds fault with me, i say 'hmmm' in a polite way n smile. then i turn and leave. no need to quarrel or argue. it appeases her as she will think that I listen to her. i just let her say. but when she's done, i leave and do my own things. sometimes u will never b able to please them so don try!! zen