Remember that part where I told you I wasn’t going to make fun of you? I lied.
But that doesn’t mean I’m not going to help you! Double negatives! F*ck!
Anyway, you’re worried about what you’re going to say to her, which is understandable, but a bit misguided.
Because she’s a person. You know people in your life. You’ve talked to people in your life before. Talk to her like she’s a person.
You’re going to be hanging out with her in a setting that’s not work, so that’s going to feel new, and maybe a bit scary. But it’s not. It’s just an opportunity to get to know her for who she is outside of work.
I don’t know where you work, but it might be hard for her to fully let loose and be herself while she’s there. So give her the opportunity to while you’re on her date.
Ask her what she’s interested in. What gets her excited (in life, not in bed you f*ck, wait a while to pop that question). What she does when she’s outside of work. What kind of art she’s into in terms of movies, books, tv, whatever.