Just don't know what to do... Confused?

[Steve]

I'm crazy for this girl. Im a senior shes a junior (in highschool). We use to have a thing back in February, she ended it. I texted her for the first time since then on monday. We were texting okay, she would sometimes text back right away, but then would take a while to respond. She kept conversation going. She even sent me a picture of her leg she hurt in powder puff. But she just then randomly didn't respond.

I then texted her yesterday and we texted for like 3 hours. She was sending and and stuff like that. She kept conversation going, but then she just randomly didn't text me again.

Whats up with that? I will NOT double text. I follow her on twitter and she doesn't follow me, and she tweeted after she didn't respond to me.
Im confused. Why would she be all and then stop texting randomly?

do i text her today, tomorrow, or wait to see if she texts me?

[Del]

ask her out 4 lunch