Good luck with her.
How big is her cage? I always wondered if you gave the bunny more room if they would be less cage aggressive. I am not sure. Maybe others could weigh in on that.
I know that none of my buns are aggressive when I change their
litter boxes or food. They have a lot of room, entire bedrooms. I often wondered if when you put your hands in a buns cage they feel like you are going after them. If they had a way to really get away maybe they would.
And definitely get her spayed as soon as you can. Buns get very grouchy when those hormones kick in. My buns only occasionally grunt and stomp at me. But I probably deserve it.
Hang in there with her. Trust me buns are worth the effort!