Your daughter is calling the shots a bit too much, but there is a happy medium.
My daughter didn't want me walking her to class her first day of kindergarten because she was a "big girl". I'm sure she could have handled it, but she was 4 years old. There was no way I was dropping her off to walk to class by herself. Period. No matter how big she thought she was. After a time and I knew for sure she was perfectly acclimated we made a deal. I would walk her to the end of the hall and she could walk the rest of the way by herself, but I would stay to watch her go into class. That was it. That was the deal. Take it or leave it. By 6, she already had a couple years under her belt, but I still walked her to class the first day of school to greet her new teacher. I walked all the way with her on days I needed to talk to the teacher or other parents who were arranging things and told her ahead of time...I'm walking to class with you today because we are planning a party or the book drive. It wasn't because I didn't think she could do it herself. I volunteered in the class, chaperoned field trips, helped organize parties. She had no problem with any of that and loved that I was there. But walking to class by herself was really important to her.
The crush thing? Get her to talk to you about it. Maybe she's nervous you'll know she has a crush on a boy in class and freak out. I was 6 when I had my first crush. I still to this day remember his name and exactly what he looked like. But fear not, the next year I experienced the natural progression of discovering that little boys are rough, gross and stinky. It was about the same time the boys were thinking girls were gross too.
I say let your daughter walk to class by herself on the condition that you will stand back, even down a corridor, and watch until you can be sure she is safe. It's normal for a mom to want to be sure. And, it's normal for her to think of her school as hers. They learn to stand in line, they learn how to walk down the halls, they learn where the bathrooms and the library and cafeteria are. It's a big deal to know all that stuff.
Surely, they should be able to find their own class.
Have her help you with things for her class parties so she will be glad to have you show up with it. A gift and surprise to her class from both of you.
AND, you're the mom so you will be in her class from time to time whether she likes it or not.
Take it or leave it. LOL.
Make a deal with her about it.