A lot of new guests don’t fully complete the profile. You are well within your rights to ask her to verify her government ID through Airbnb and to tell you a little about herself and her plans before you approve.
She could just be clueless, not a scam.
If she is unwilling to do this, then it may be better to decline.
It’s a new (and annoying) policy on Airbnb that the hosts don ‘t see guest photos until after approving them.
EDIT: As a new host you might be better off avoiding accepting longer reservations until you get the hang of things. It’s better to accept many short term reservations, so you can build up your reviews, and not get stuck with a dud guest for a long time. Once you’ve done it for a while you will develop better “Spidey sense” to avoid the bad guests.