I agree that she is probably just hungry. I think you could feed insects twice a week, with CGD available all other days. When she is bigger or fully grown you can back down to offering insects once per week and providing fresh CGD every few days. She is on the small side for her age, so you don't need to worry about turning her into an overweight beast just yet.
When you do feed insects, I would offer them in a bowl or introduce them into the enclosure in some other way than with your fingers (like on tongs or out of a dusting container or bag). I have had a few cresties that would shoot straight up out of their enclosures any time I opened it to try to get to my fingers, because my fingers were what delivered the insects when they were offered. You can offer the insects in other ways so that your fingers are not associated with food.
Sometimes, crested geckos are nippy out of aggressive or fear but I really don't find that to normally be the case. Even the most oddball crested I ever had would mostly gape at me and puff his body up, but not bite. Other New Caledonian geckos can be prone to cage aggression that includes biting but that is very rarely ever the case with cresties.
And as far as handling goes, my general rule of thumb is to wait a week after being shipped or moved to a new enclosure just to give the gecko the time and space to settle in and feel comfortable in their new environment before being interacted with.
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