A recent article pointed out that the successful O’Neil strategy to contain and defeat Reagan was to give him rope, and to not defeat the agenda in the short term in Congress through control of the calendar.
I think that Hilary officially joining the Wisconsin recall campaign will seem like a sour grapes strategy. If the recall delegitmates or, less likely reverses, the result, Clinton gains regardless of her formal position, I would think.
But by continuing to make it a Trump Versus Clinton narrative, you only delay the time at which the public will turn from its (non-plurality) choice.
If, even worse, this means that Clinton has not yet recognized how bad the family is as the carrier of the democratic and Democratic message, we are in for an even tougher time. Sorry to be blunt.