Sunflowergirl1360, your situation is common and not a lost cause.
During my life, I've moved all around the country and left friends behind 7 times. Each time I moved away from good friendships and found virtually all of them too willing to let go of the relationship - being out of sight, out of mind. I had a choice though and I chose to be the assertive one to maintain contact - with letters, calls, and occasional visits. Since high school, college, and work life eras, I've lost half of those friendships, but today I still work to maintain the ones that I can, having over 50 of them all over the U.S. and overseas. I do make occasional visits, but more often maintain the relationships with emails and calls.
Might I suggest that your good friend is worth hanging onto. Maybe she doesn't realize that you two can still share your lives apart. I separated from many of my friends 30-40 years ago, yet we've stayed in touch and continued to enjoy sharing each others lives. One way I accomplish this with so many people is to put them onto my calendar for a letter or a call - twice a year minimum at Christmas time and on their birthday. I also make many trips around the country and the world visiting them at various times. It's a one-way effort, but one I feel is worthwhile.
I'm sure you can hold onto your friend if you commit to it - and look forward to occasional visits in the future as budget allows. As you two both grow older, the invested years will be appreciated.