Hamsters should never ever eat Chocolate and you shouldnt really let her Lick your fingers.
Chocolate contains theobromine. A naturally occurring stimulant found in the cocoa bean, theobromine increases urination and affects the central nervous system as well as heart muscle. Chocolate could kill a hamster.
Hamsters enjoy vitakraft treats, I have a few packs. I have "milk and honey", "strawberry" and "yogurt" flavoured ones. You can buy them from all good pet shops. Hamsters love them!