What she can do is up to you, but it would tie in to the element she possesses, Balance is basically Light, Forces is mostly dark. As an example, she can calm an over-boiling situation with a calming effect if she feels she needs to.
weredragons change in the same way, they change at will to humanoid-ish dragon-like creatures. (Like anthro dragons, basically) generally they notice abilities first, and transform afterwards when the shift is triggered the first time, afterwards, it happens voluntarily. Generally the trigger is high levels of emotional stress and excitements.