Maybe something snapped, it’s possible, but that only ever works in one direction. “Snapping” suggests a period of pressure that the “snap” – or reversion to natural state – then resolves. If she genuinely snapped and in that “snap” she changed in character, that only means that this is who she was all along. For myself, I don’t believe even that much. This whole thing sounds like the beginnings of a plan to blame it all on the fiancé whenever she wants to reenter politics.