I dunno.
Run through 120+ since Jan 2011 via POF & OKC (only 2-3? On tinder? & a handful "organically") & of those, I don't recall ever texting first. Ever. Msg first? Sure.. Copy & pasted carpet-bombed the shit out of those sites daily. And out of those who replied (about 15 out of 20 replied), most if not all would give their # first. Then I'd give my #, & they'd always text first & probably met at least half & can count on one hand the number who didn't sleep with me the 1st night/day... Despite them ALL saying they didn't do that.... And swear to god I had my fingers crossed they didn't, but they 98% did. Professional girls too. No hoochie spanks. If I thought or found out before hand they'd met dudes before, I wouldn't meet'em. 0% chance.
So, if she's not texting back. Someone else has her attention and you're not good enough... N she's already getting piped down for a few hours a day by a test/Tren/cialis/Viagra fueled fella like me who'll probably get bored after a while and maybe she'll return your text then. Just hope she's not stretched out and ruined for all other men by then. But at least maybe you'll at least get to hit it once. Do it well enough and be interesting and maybe you can get a repeat customer.
Hope this helps... Speaking of repeat customers, its 3fuckin am?? I'm goin back to bed.