She didn't text back?

Anonymous
So I met this girl on the elevator she study on the same college as me and on the fourth time i met her I asked her number and got it.
I texted her for 3 weeks (not everyday) she took 3 hours to respond my first text, one time i took 2 days to respond her text cause I forgot my phone on my dad house so after I respond she took 2 days to respond too. She is not very open over text, but when we talk in personal she is very open, aways smiling and asking me question (not personal but about college).
So one day I decided to ask her out, I don't like to do that over text but we never met on the elevator after i got her number , so after I asked her out by text she didn't respond.
I don't know what to do it already passed 1 week without texting.
help please !!
She didn't text back?
2 Opinion