I made her laugh, what next?

Ask her what she's up to.
Comment on whatever she's doing if you think it could get a conversation going.
If she asks what you're up to, tell her you're fucking around with your guitar or whatever you do that you think she might like.

CHARGE YOUR PHONE BEFORE IT DIES
you also want to move to meeting in person/getting her number ASAP

Ask her how guys she's been with. It's a good tension breaker.

>....
abort OP

Tell her thank you for her time and leave

>>37592929
She hasn't responded when I asked her what she was up to.

the ... signals that the joke was lame. You should have followed up with something charming.

Say, "What's so funny? I was serious you cunt."

>>37593216
What was that first line even supposed to mean?

Say: i just want to make sure I shoot up the right school.

>>37592594
No she didn't laugh. That's sarcasm. And your entry is absolute shit. She thinks you're a joke.