[cypher]

All hams are different & enjoy different things so it can be a bit of trial & error getting things right.
Which cage is she in? Sometimes it just a case of boredom, if the cage isn't big enough or the set up isn't right with lots of enrichment,.
Simple things like scatter feeding or hiding food & or treats around the cage can help, making things like toilet roll treat toys so they have to work for food can keep them busy for quite a while & distract them from bar chewing.
Whimzee/antos dog chews are about the best thing for them to chew on, most hams really enjoy those rather than chew toys sold for hams.
Bar chewing can also be attention seeking, it's always best not to "reward" it by paying attention when they're actually doing it & only go over to the cage when it stops.
It can become a habit which is hard to break in which case a tank style cage maybe the only answer but you can try other things first.
There's a thread here that might help.
Managing Bar Chewers