She's called a Cougar here by flirting with you and every guy should have at least one fling in their life with an older woman. But don't look for a long term relationship here although they do happen but also its very dangerous to have an office romance as it could come around to bite you in the butt so be careful what you do here as she could eat you alive and spit you out , embarrassing you to death at work.
She may just be a big tease here and having some fun but make sure she isn't married or has a huge BF that could tear your head off. Good luck and have fun
