That's interesting, because when Gabby's mother was interviewed recently she says that Gabby and Brian had broken off their engagement. Her mother, Nichole Schmidt, says they both felt they were too young. She added, "they were really just boyfriend and girlfriend."( This was in the NYPost)
This sounds as though they broke off the engagement sometime during their road trip, and Gabby shared this information with her mother, apparently after August 26th? Maybe this isn't at all relevant, as it's obvious they should have never been together in the first place.