Hi, from what I have picked up and read (Although not from personal experience) the little Polish Dawrfs can be rather territorial, as can all bunnies potentially, but Polish possibly more so.
Has your bunny been spayed? An unspayed doe can be extremely territorial and also very aggressive sometimes, and spaying will usually help ease this behaviour ether somewhat, or even eradicate it. Also, I know it's off the original topic, but I always mention this, an unspayed female has a very high chance of developing uterine cancer, so spaying is always most important.
Right, back to the point. Allow your bunny as much time as possible out of her cage. This can help make her less 'dependent' on it as she also has plenty of other ground/area to explore.
When you open her hutch, and she runs at you growling, try not to pull back, as this will reinforce her dominance over you. Dont try at this point to reach in and grab her food bowl, she will instantly defend it. Place
another bowl of fresh food and also a couple of her most favourite treats just far enough away from the hutch so she has to leave the hutch of her own free will to get to it. While she is happily sniffing and sampling and nomming her yummy breakfast, quietly reach in and take the used bowl out. This will help the 'challenge' situation from even occuring,
hopefully.
Over time, offer the fresh bowl of food nearer and nearer to her hutch, but always try to keep it as a distraction while you reach in to get the old bowl, until, hopefully, such a point arises where you can put the new dish in her hutch and remove the old one without attack.
I had a very large bunny (male) who went through a stage like this (post nueter as well) and found this technique did help, and eventually I had no problem with him.
It can also be quite dependent on whether bunny's desire to fill her belly is stronger than her desire to give you a good kicking for trespass offences
'Belly over Bovver-boots' I call it
Hope this helps you somewhat, and Im sure on this wonderful site there will be quite a few more helpful hints coming your way.
Good luck!
Annie x