As AJ said, we all struggle at times and can slip up, especially when something is playing with our emotions. What is most important is trying to pick yourself up again and start again. When I'm struggling I always try to remember this quote:

“Courage doesn't always roar. Sometimes courage is the little voice at the end of the day that says I'll try again tomorrow.” ~ Mary Anne Radmacher

As for your friend I also agree with AJ. Unfortuately even people who struggle with similar concerns don't always know how to react when they become the supporter. While she shouldn't be ignoring you, it could also be that it is reminding her of her relapse. Is there anyone else you can talk to? Even relying on the PC community for a while. You shouldn't have to go through this alone.