Ah, I see... two further thoughts:
is she actually biting then or is she beak bopping? Sometimes they "angry beep" and beak bop as a sort of "personal space alarm". Usually it is not a hard line if you are gentle and the bird trusts you. Hima will set off her Hima alarm if she doesn't feel like being petted, scooted, or picked up, but she will not actually bite. Especially if you apologize and explain you are moving her for her own good, or if you decide it isn't a big deal and leave her be. We usually respect her Hima alarm wishes unles it is a safety thing.
Other budgie bop times it is while chattering, often accompanied by raised head or face feathers and a lot of dancing around or running back and forth and or head bobing. They often will rapidly invade personal space and leave it repeatedly. This is a friendly behavior if so. It can be done between friends, mates, between one and an inanimate object, etc. Most often done by males, but some females do it too. You sure you have a ladybird?