My fiance and future mother-in-law

I (20F) have been living with my fiance (21M) for about the past month. We have been together for two years now but just recently got engaged and decided to move in together. Since both of us are full-time students, we cannot afford to buy or rent at the moment. My fiance's parents are allowing us to live in a trailer house that they have on one of their properties without having to pay rent or utilities. I am grateful for it but I would much rather live in my own apartment or home if I could. My fiance's mother and father are great and have done nothing but support us. Which is why I don't know why I feel the way I do. My future mother-in-law does a lot for us. For example, the house did not have internet when we first moved in and she told us that it would be our responsibility to get it set up and pay for it each month. Which we completely understood and were totally fine with. But as soon as she heard that we were ready to get it set up she took the initiative and called the company and set it up under her name since she is already in good history with the company and they would not charge us the deposit fee. Which is really nice of her but I couldn't help but feel a little upset for some reason. She has also offered to build us a king size bed frame and dresser. She came in the other day and took all the measurements for it. But she did not really ask us if that was something we wanted. Apparently she mentioned to my fiance that she was going to do that but I didn't know about it until she came over to take the measurements. It is really nice of her and who wouldn't want a bed frame and dresser built for them. But for some reason again I still felt a little upset. She also brings us a few groceries here and there occasionally. Which is also nice of here but again I get a little annoyed. I should probably add that before we moved in together, my fiance lived with his parents and I lived on campus. At his house, his mother would cook, clean up after, do laundry for him and a lot of other little things. I as worried that he would expect me to do those same things for him after we moved in but I told him to not expect me to do all that. And it hasn't been a problem, he helps with dishes, cooks, laundry and whatever else needs to be done. He is not bothered by his mother offering to do stuff for us ( or doing without asking) but it irritates me a bit and I don't know why. It makes my fiance get irritated at me because he does not understand why I am so upset about someone helping us out. Maybe he's right and I shouldn't feel this way but I don't know how. Am I being unreasonable? Is she overstepping? Feel free to leave any advise, questions or just comments. Thanks for listening