@cornelljdav,
No - you want to be more than friends. And the sooner you own up to this, the sooner you'll realize that you're essentially being untruthful to her about your intentions.
I realize she is right there at work, but unless there are only two of you in the office, you can go elsewhere and talk to others, right? Be work-style cordial, as in, you're not a jerk to her but you don't go out of your way to pal around. Don't go to lunch. Don't hang around for coffee. Don't shoot the breeze just after or just before, and don't have conversations beyond work and the usual "Good morning, how was your weekend?" pleasantries. Treat her as you would a little old man you work with.
And find other people to hang around.