I agree with chesca, not many hamsters actually chew! Why not try creating some "Brain toys"? These are fun and stimulating, and they help improve your hamster's problem solving capability. One idea is simply a toilet paper tube stuffed with tissue and treats hidden in the middle and covered so you hamster must shred the tube or pull all the tissue out to get the treats. Do you bowl or scatter feed? If you bowl feed, why not give scatter feeding a shot? It's fun, natural, and stimulating for your hamster. Is there any particular behavior your hamster is exhibiting that makes you feel she's in need of more enrichment? If she doesn't show any signs of being bored, chances are she's actually quite content as is