The choice is between two emotional attachments. Finding a good used car in Steph's area is not quite so simple. Waiting until she has the license means that specific car could be gone, then the search starts over, with all the stress associated with that.
But I agree that, as difficult as it is, Steph needs to distance herself emotionally as much as possible. Again, that's not easy. As Joe says, it's the future that is the primary focus. The ultimate goal is to move forward.
My first 35mm camera was a Konica C35V, and for the life of me I don't know what happened to it. When I returned to RFs, I sought out a good C35 (RF version) just for "old times sake". It's nice to have and helps connect me to the original C35V, which was really important in my photographic life. But if holding on to the current C35 got in the way of moving forward, I'd be able to part with it.
I suspect that whatever Steph decides to do, she'll make the right choice for her. Her desire to move forward is really strong. As painful as giving up the P and lenses might be today, reacquring a P kit in the future would heal that wound. No, it wouldn't be "the same", but then her life won't be the same, the river will have flowed and sticking a toe in will be a new adventure, not an old one.