girl advice: what would you do about this girl?

[Niik]

Hey,
Im a 23 year old a guy, I've known a girl from college since I was about 20.
She is really goodlooking, nice, friendly, and smart. We get along well, but we aren't close friends. We hang out occasionally, get coffee etc.
In may she told me in a text mesage that she liked me as more than a friend. I denied liking her back, saying I suppose I just see her as a friend. I am really shy about it, because i've never had a girlfriend before and I don't really know what to do.
Last time I saw her was in August for her birthday, we had a group dinner.
IT was my birthday last week and she remembered even though I dont have facebook and messaged me and sent me a shooting star birthday e-card to my email.

Anyway- about an hour ago I go this text from her:

Hey nick, how was your birthday? I've been really sick for the last week, its exhausting. Pretty much just eating choc chip cookies and staring at my computer screen. Can you please send some pink flowers?

What do I do?