I think things has changed dramatically in these cases since 1978. As others have mentioned you have to take into consideration who her perpetrator was, and the position of authority he had over her. Right after the event, the person raped is very traumatized, and in this case I imagine she was extremely afraid to come forward.
In this case I would tend to believe Juanita — based on Clinton’s actions towards other women it makes perfect sense. I would even wager a bet that there are other women he assaulted that haven’t come forward yet as that is often the case with perpetrators such as this — and these women may never come forward simply because of the extreme pressure his accusers who have stepped forward have faced. Not to mention the infamous way the Clinton’s have of dealing with their foes...
Still, in this day and age when there is a lot of support for Rape Survivors (and other survivors of Sexual Assault type crimes) some still don’t come forward and report the crime, or go to the hospital. That is something we as a society need to work on still, IMHO. Many communities don’t have the resources they should for women (and men) who experience these types of crimes... I wish they did, and I wish more women would report these crimes. There is still a lot of bad sentiments against women who are preyed upon in this way — it’s very unfortunate and causes a lot of harm.
CORRECTION:
In the first sentence of my post “has changed” should be “have changed”...