Dear Lidewij:
For a friendship and any relationship to work for your benefit, it has to be a Win-Win proposition: win for you (and win for the other person). What your friend is doing, reads to me is maintaining a somewhat Lose-Win friendship: Lose for you (specific example: you driving 35 minutes to see her) and Win for her (she driving only 15 minutes to see you). Understandably a Lose-Win friendship is distressing for the one on the Lose side.
The fact that she ignores your messages when you can’t Lose to her, may mean that she wants it her way and is communicating to you: it is my way- or the highway: either you are my friend the way I want you to be or there is no friendship.
If this is what she is communicating to you with her silence, this is further distress for you because you want honesty and fairness in a friendship, not dishonesty (manipulation) and unfairness/ inequality in a friendship.
I recommend you either make it a Win-Win (seeing it is a win for you is your primary responsibility) or let it go. Not every friendship and relationship is worth keeping.
anita