It may be necessary for you to go ahead with your plan to let her make the next move. She may have become too comfortable with the fact that you would always be available.
In order for any relationship to work out, both partner have to contribute to it. If you are giving more than 50% and she does not reciprocate, you would burn out. You've already noticed that affection is missing from her conversations with you. It is hard to keep up with a long distance relationship but not impossible.
It all depends on what each partner expects of the other and what sort of a relationship they a re willing to work on having.