Whether a distance is too great depends on your means of transport and income.
To walk would take most of a day. That would be impractical unless you moved to live close to where she is - and that would be taking a big risk considering you don't know what sort of person she has become.
To cycle would be just possible providing you were very fit.
If you have access to public transport then the distance would not be too great.
If you have a motorbike or a car and can afford the fuel to travel both ways fairly frequently, then it would be easy to build a relationship.
At present, it seems you don't know if she has a boyfriend or is interested in someone.
When young people can seem very different to the people they become.
I had a friend at school. In those days we were close; we discussed school work and life, our families and interests. But I never thought to inquire about her values.
We remet several years after leaving school, and I discovered she was a racist, an opportunist, entitled, and had zero empathy for anyone. In conversation over lunch, it turned out that her parents had raised her with those values.
After that, I refused to have anything more to do with her.
I share this story as a warning to be very careful. You may find her beautiful and carry deep longing to get close to her, but you cannot yet know who she has become. Please, take your time - and be prepared for the possibility of disappointment.
I know good looks are compellingly attractive to young men, but in the long run external beauty fades, and all that's left is quality of character and (hopefully shared) values.
These latter are what make the real difference in best chances for a successful relationship. It takes time to get to know who someone really is.
