CV, if your conversation happened then she knows what he's thinking and can make decisions based on that knowledge. {It would only take someone saying that to me one time and my decision would be made.)
Communication is how we express our needs and it helps others respect us as an individual.
Without having that conversation she's (and we all do it at some point)operating on assumptions.
If he didn't ask her to drive up and became resentful that she didn't, I say that's his issue. If he acts out, then she might say, Are you feeling frustrated because I didn't drive up to be with you? That's a step in opening up the conversation to get their needs out in the open and work toward getting both needs met in some way.
It's not a fast process and would probably take several conversation.
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss