I know for me, just knowing that I COULD text her while she is away would be so comforting that I probably wouldn't even have to text her at all. Why don't you just resolve to only text her if it's an emergency or if you are truly troubled..... And as some people said, if she didn't want you to contact her she wouldn't have said that it was ok to do so.

Good luck!

PS: My therapist allows no texting, no emails, nothing but voice messages about re-scheduling appointments and such. She is a blank slate and does not open up about anything... Old school, I think.