As this point chew items, though a good thought, won't be enough to get her mouth lined up correctly again. She will need veterinary help to get the teeth back to a length where she can eat properly.
You can read about dental disease in rabbits here
http://www.veterinarypartner.com/Content.plx?P=A&A=472
The best method for handling the reduction in tooth size is to have the vet use a dental grinder to get them in better shape.
Hope this helps you!
Pet Health Care, Rescue,Train,Breed
30+yrs pet vet care & nursing, rescue, behavior & training, responsible breeding, small animal care