Eh. I really can't see Murphy ending a fifteen-year friendship and newish relationship because Harry spoke to her dead father three years ago. It isn't like Cap'n Jack is alive and in hiding; the guy is dead and remains dead, and nothing Harry can say or do would change that. If he was a ghost like Sir Stuart and Harry knew about it, or was otherwise contactable for Murphy to have a talk with him, it'd be different, but even the local ectomancer isn't willing to do that to Jack. She could get irrationally angry, but not to the "HOW COULD YOU DO THIS TO MEEEEEE?!"-level Cassius did. If she did react that way, then it'd read like a total relationship cop-out, like Jim was just trying to end things without killing anybody.