Hey
two things, first:
It may be a problem with comfort before getting the number. It is really easy getting a number but a completly different thing keeping contact. I would do some nlp just before doing to number. just ask her about a place she feels really comfterble. Ask her to describe it with all her 5 senses. Then get yourself into that place. She will automatickly feel more comfterble with you and then respond better to txt's.
another tip:
check out this link with good text openers:
1-vt21175.html?start=0
hope it helps