Since you don’t have that many friends I understand that you worry about it, I feel sorry for you.
At this point it seems like she has other important matters in her life. Perhaps you can try to be part of those matters? What is she doing all the time? And what did you used to do?
Altough, I’d try not to depend on this friendship, expectations can dissapoint you. Not that I am good at it :p but it’s worth trying.