Does she have something rough in the tank to scrape her skin off?
How is it bad, is it sticking in certain places (ie toes or tip of tail) or does it look like its just continuously flaking but never actually coming off in big peices the way its supposed to?
Depending on exactly how the shed is bad, you have a few options. For toes and tails soak her in a little bit of warm water and assist her in taking off the remaining skin. If she doesn't have something rough in the tank to rub against, try giving her something.
If the skin looks flaky all the time but isn't peeling properly it could be some kind of dermititis, which would be crappy. I havent seen that is leo's before, usually in swifts and lizards with keeled scales. If this is the problem then you should take her to the vet asap
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