Aaw, I hope everything works out for the best @
iPhone. Very sorry your friendship - which was obviously very close to begin with - has now this great distance in it.
I'd just like to throw something out there: Were you sending a lot of texts on a daily basis to your friend? Maybe she felt bombarded or overwhelmed and just couldn't answer them anymore? As I say, it's just a guess but it's something that can happen between friends.
Whatever the case I hope you guys become close again.