Exactly which people often forget, In fact when she announced her favorables were still fine. If one thinks this rebranding is exclusive to Hillary and another democrat doesnt have the potential to have their character dragged in the mud, then they have another thing coming to them.
If I recall correctly even after the email scandal broke she still had pretty good favorables and well ahead of her GOP opponents. It was well into the election primary campaign with both Sanders and Trump going after her on it that her numbers started to to drop.