Hm... I wouldn't worry about it for now so long as she's got somewhere she can soak if she wants and she's not acting differently. My old guy (15 years old) will look really dingy and get kind of a dry feel to his scales for a pretty long period before he sheds. Look for lateral folds where she bends; like, folds kind of going from the belly straight up toward the spine; those are a pretty clear marker of a retained shed.

There's always a lot of guesswork involved with my old one shedding because he has cataracts in both his eyes (completely blind) and it's pretty much impossible to use the eyes to tell when he's going blue. He has never had any problems shedding, but the timing of it and the state the skin gets to before a shed have changed quite a bit as he's gotten older.