Welcome to HealingWell. this is Kitt.
I agree you should get into some counseling for just you. Even if you don't feel depressed you still have some issues you need to put to rest.
As far as you friend, if she has lived in your town for 2 years and feels isolated and depressed, I would let her go. This is her decision and what she wants. You are very comfortable in your hometown but it has not grown on her and she does not feel she belongs in your town.
The greatest gift you can give her is to let her go with no guilt on either side.
Times change and we grow in different ways.
I wish you the best and please keep on talking to us.
Again Welcome to HW.