They do that a lot when they breathe. They really lack a diaphragm, so they don't generate oxygen intake quite like us. Are you sure you have a female? Sometimes males in their prime (especially male cherry-heads) will do this when they want to mate, or establish dominance. I assure you as long as he/she isn't mouth breathing, or has a runny nasal discharge, head bobbing is perfectly normal for a red-foot.
No I'm not sure of the sex, I just assume its a she. And she had a little snot bubble earlier today, but that was it. And she yawned, but no mouth breathing. :O And shes/hes about 8 months old.
Yes, they do that a lot, especially when a young hatchling and new to your house (breathing, exacerbated by nervousness being around humans). It may subside a bit as s/he settles in and grows up a bit, but you will still see it. In my house, we joke that our tortoise always says yes, never no! "See...Trevor thinks its a good idea!" hehe
I agree with Mary Anne keep an eye on her and make sure the temps are up around 85 in her hide. I find that mine bob their heads when their smelling something also. Is she in a new enclosure?
I will, and yes she is in a new enclosure. I just brought her home awhile ago. She is still acclimating, but she is very active when she comes out. And is eating like a little gremlin!