Mother in law problems

How do y'all deal with your mother in laws? Mine is really sweet and so helpful with my step daughter but she really has a problem with sticking her nose in places that it doesnt belong. She is very active in her granddaughters life, she watches her during the day while both I and her father are working during the week. We share custody, her mom gets her a week at a time so during the week we have her we only really get to see her for 3 hours a day during the week then saturday and sunday and her grandmother has her the rest of the time. My mother in law is constantly late dropping my step daughter off at home giving us even less time with her and then constantly coming over on the weekends or getting us to go over to her place once again taking extra time with my step daughter when myself and her father already get so little time. she makes really annoying comments too like she did this morning (I like to be the one to bathe my step daughter, it gives us some bonding time plus it allows me to teach her how to properly wash herself so she can start doing it alone) my fiance has never had an issue with this, he likes that I do that with his daughter. Well this morning he made a smart ass comment about me "not letting him bathe his daughter last night" he didn't mean it literally, was just trying to get a laugh out of me. Well his mom turns on me and.starts saying things like how we need to take turns doing those kinds of things. It annoyed me big time, and she does stuff like this all of the time. When she comes to pick my step daughter up in the morning while my fiance and I are trying to get ready for work ( we share a vehicle, I start work at 8 and he starts at 8:30 do he drops me off at work before he heads to work) I like to leave the house by 7:30 so I have time to pick up a coffee before my shift starts. My mother in law knows what time I like to leave but still shows up 5 minutes after 7:30 which majorly drives me crazy, then as I am.trying to get my fiance out the door so we can leave she goes to my step daughter and pushes her to "give daddy one more hug and kiss" which is cute and would be fine if my shift didnt start in 20 minutes and their goodbye hugs and kisses didnt take five minutes. She also has a key to our home and will sometimes just walk in without texting or calling one of us first to let us know she is coming over. My fiance and I just signed a lease for a new place and are moving at the end of the month. I want to ask my fiance not to give his mom a key to our new place but I dont want him getting mad at me. He knows I have some problems with the way his mom acts sometimes as I have brought it up, smaller things though. Like how it upset me that she constantly takes the things I buy for my step daughter (clothes or toys) to her house then never brings them back and how she never gives the three of us family time because she is constantly asking us to bring her granddaughter over to visit. I don't know how to go about this. I love that my fiance has a good relationship with his mom and that his mom is active in his daughter's life but it feels like she thinks of herself as more a mom then a grandmother. I want her to step back a bit but I dont want to sound like a bitch when I talk to my fiance about it. My step daughter starts preschool in September so that is going to help but then I feel like my mother in law is going to come to.our home more often to visit which I dont want. Every time she is in our home she makes rude comments about my.kitchen being a bit messy or something like that (my fiance and I both work, plus I am a full time college student it's hard to clean up every day) and she always over stays her welcome. On more than one occasion has she conveniently stopped by our house around my step daughters bed time and stayed for an hour or longer not letting me put my step daughter to bed. I dont know what to do. Does anyone else have the same or similar problems with their mother in laws or suggestions on how to get her to step back without making her mad at me?