It's undoubtedly BS.
Franken sent her an apology for the photo incident in which he said "I understand why you could feel violated by that photo". Why on earth would he do that if she were in on it?
I have no answer for that other than the current political environment. Looking at the photo, it seems very staged. That isn’t to saw she was in on it, because she could very well be asleep. But it looks to me like his hands not touching the Kevlar vest. Of course, I am no analyst so, what do I know? If the Moore supporters can ask ‘why did it take years for allegations to come out?’ then the same should be asked here. Franken ran for Senate a few months after this incident, and had far less (if any) political clout to keep it suppressed.