Biting/lunging/grunting etc over husbandry practices such as changing food point to cage aggression. Sometimes it is limited to things like changing food, but sometimes worsens if not addressed. Fairly common for her age and especially gender. There are many different methods you can use, including mixing different methods. Most will take time, and not letting this behavior become ingrained will be very helpful. She very well may have displayed cage aggression at the breeder or previous owner you recently got her fom. Rabbits will often temporarily halt cage aggression after a move, until they feel settled into their new territory. Some things to try:
-make sure she gets plenty of time outside of the cage
-feed her in different locations, and start feeding especially special treats out of your hand. Don't always feed her in the bowl in her cage basically, and work to make it where she clearly associates you with food.
-some find a cage that opens at the top helps with cage aggression. Not always though.
- some pin the rabbit to the ground as they perform husbandry routines, as you have described
-some chose to simply shift the rabbit to a pen, or choose that time for them to play outside the cage while cleaning, changing food, etc.
-some distract the rabbit with something they adore such as a special treat
-some wrap their hands so that bites are not felt, and let their rabbit go to town biting them. The rabbit usually gives up after a while since the desired reaction (hand out of their space) does not occur. Remember that flinching away from a bite reinforces the behavior.
Things like you reaching in to pull her from the cage, then placing her by a treat or releasing her for play time help rabbits associate you in their cage with good things.