I've had my share of my life taking over and friends feeling they have been left behind. But it's usually because they don't understand how you feel. I agree with above, write a little letter to explain, chances are that she feels just as bad and will appreciate you making the move!
My best friend moved back to Ireland and I would say that distance hasn't hindered our friendship either, we are always there for one another, but we don't live in each others pockets!
Life does have a habit of getting in the way, but that�s life! If you explain your difficulties and she still ignored you, then leave it go!