Farmer Steve,
Cage aggression in does is, in my experience, hereditary. It is likely that your rabbit's mother acted similarly when she was ready to be bred. Taking away her food or pinning her to the ground (in my opinion) is not going to change her behavior because it is entirely hormonal. Unlike with a dog or other animal, physical punishment does not work well because rabbits are a prey animal and their first response is to be fearful.
For general hormonal cage aggression (this being any type of cage, food, or other territoriality), spaying will help. Be patient as she recovers, it does take some time for the rabbit's hormones to settle.
In the meantime, when I have minimally aggressive does that nip or "box" my hand, we nip that in the bud right away! I personally prefer to get on their level and scratch them on the head while I pour the food in the dish. This way, they are distracted and their head is kept away from the dish while I'm filling it. I have had a lot of success with this and many of the does end up liking the attention and really enjoy those head rubs at feeding time- so much so that the aggression totally disappears.
Just as a note for the future, this is one reason that obtaining rabbits as adults can be really beneficial. By this time, you can see exactly what their personality will be like, whereas buying a bunny as a baby- you never know. I realize in this case, it wasn't really your idea to begin with so no harm done. I just thought I would mention it incase you ever add to your bunny collection!