If you feel that she is the one etc, then do everything you can and visit her. Otherwise, move on. Not because she or you aint worth it or stuff like that, but because unless one of you is willing to relocate, it wont work out and it'll just keep hurting.
I know it feels like you would do anything to chase her and not lose her, that you must not give her up, that you can still fix it, but if she asked you to stop and that she wants to move on, you should respect it. If she loved you as you said, then she's hurting as much as you do, it's not any easier for her
I've just came out of a very similar situation, long distance, both fell in love, I was her one, she was mine, stuff happened, it ended, still love each other but not gonna happen.
I used to feel that Im done with romance, that I lost the one and only, the woman I was made for etc. For a month after we broke up we kept texting, telling each other we miss us, and we're still in love etc. Then I realized that I need to let go, that it'll just hurt from now on unless I give her up. While I still believe she is the one, I accepted we're over and focused on moving on. If we were close, I wouldnt give up, so if you can fly to her now, do it. Otherwise, stop wasting your life on that, and focus on moving forward too. It'll be for the best of you both
While long distance relationships arent impossible, I know people that got married after meeting online from half the world away, but if you're having problems now, just imagine how worse it will get when you're in person etc.
I'd say fly to her now and fight for it, or keep it as a nice memory and move on
Im sorry if some of the stuff I said may come out as harsh or offensive, but Im not trying to offend you, as I said I literaly came out of a similar situation and I'm trying to be as blunt and clear as possible!