Creepy or ok to message her?

Aevatar
So I am in a musical with this girl and she has been nothing but nice to me. I'd like to say she's flirting but I'm a guy and we misread that so I always just assume a girl is being friendly. We added each other on Facebook and I'd like to get to know her, but she's younger than me by more than a couple years. Is it acceptable to message her and talk to her in a friendly non flirty way or would that still be creepy? I'm not good speaking to people directly until I've had a chance to get to know them a bit. Trying to speed up the process.
Creepy or ok to message her?
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