She goes in October, after the Benghazi Committee and Gowdy can be blamed for her demise, and which will fit in nicely with the DNC electioneering against those mean ole Republicans. This would cause a little energy, and would help with the enthusiasm gap Dems are presently suffering, with the insufferable Hillary Clinton.
She stages some sort of minor medical event to give her an excuse to exit gracefully. Rumors are that she has early MS and have already had a series of minor strokes.