Call up a girlfriend every once in a while. Share a joke over a cup of coffee. Arrange an impromptu tanning-session while you lay on a blanket in a park. Go shopping. Indulge in a makeover. Do whatever you want, just don't forget them.
Your friends make you who you are, and regardless of extenuating circumstances they are your foundation. It's true that some friends are for seasons, but those who matter are here to stay. So cherish her and let her know she is loved.