I feel like there's a bit of whack-a-mole going here.
Not sure that Warren leaked it. She confirmed it after someone else leaked it, looks like. I also wouldn't read it as an attack on his character, and as an aside, treating it like one is pretty damaging, IMO. It's like something SDW does with race. "How DARE you insinuate that I might have racial bias--that's the worst thing you can possibly say about someone and you'd better have damned good proof! Also, everyone to my left is a racist, and no I can't prove it or even explain why I think so." I don't remember Warren's staff siding with Bernie's version of events, but as I said, it doesn't seem like there's much of a difference between the versions anyway, and what there is could easily be explained by different people remembering it differently. Also don't know why you think that any indignation she felt was feigned. If you assume bad faith from the start, of course you're going to conclude it.