My In-Laws....

My in-laws have been here since a week before my baby was born in October.... they are really some awesome people, but my MIL has some really bad habits. She chews with her mouth open, she talks about everything 3 times, and she sucks at washing dishes. An example would be we had bacon the other night and I have asked her to hand wash all my new pans because the dish washer always leaves water spots. (I know it's weird that I care) she hand washes the bacon pan first and every dish after (including the bacon pan) that she washed was extremely greasy. Idk how she couldn't have noticed and she does these things constantly. I have super sensitive hearing and I can constantly hear her chewing. The worst part is that she eats a lot of loud food! (i.e. carrots, celery, popcorn.) I can even hear her chew icecream cause she freaking smacks her mouth and talks with it full of food. This is one of my biggest pet peeves and it's making me go freaking crazy!! Idk how to tell her to chew with her mouth shut nicely. I'm pretty sure that they are moving in with us and my husband is super happy about it. I am still on the fence just because of my MIL, but she has really helped with my baby since he was born in October. Any advice?