Given what we know of what she has already said, I would take that bet. Apparently that is what O'Keefe may have.
The only question is whether such tape will ever see the light of day.
Just like the Khalidi tape in the hands of the Los Angeles times. The press corp only "discovers" incriminating evidence if it hurts Republicans, never for Democrats.
On the other hand, i'm betting O'Keefe has a whistle blower who sent him this recording. Might be someone in media, but more like someone in the Democrat campaign staff. There are a lot of people who hate Hillary, and who would likely hate her more than the people she abuses?