How do I handle this politely?

So my in-laws are coming into to town to visit. I adore them and love them so much. As my daughter has grown, she’s almost 3, I’ve had a harder and harder time with each visit. When I put her down for naps, if she cries my MIL will go in and get her. This ruins me trying to get anything done as I would during nap time. My MIL will constantly give her snacks throughout the day because she thinks she needs to eat more. My daughter is perfect weight for her height according to her doctor. She’s insanely tall for her age and has a thin waist because of it. Because of this she won’t eat at meal times so then my MIL will start offering her 50 different options. My daughter will eat part of one and then won’t want it. So my MIL will offer other things. Then bedtime… oh goodness. She goes to bed at 8:30 at the latest. When my MIL is visiting to will do the same thing as nap times and go in and get her. Then she doesn’t get to bed until 11. I’m exhausted and lacking sleep every visit because of this. I’m the one who puts her to bed too.

So after they leave my daughter is now in a new routine and we have to break it all over again. They visit a few times a year so it isn’t just a one time visit. I’m 11 weeks pregnant now and already tired from hormones as it is. I don’t want to point a finger or anything like that. I just want to bring it out in the open in a polite way. Any ideas? Oh and I just remembered they decided they’re bringing their 6 month old dog too.