Another source:
“Minnesota Republican has known for days that Ed Rollins, her campaign manager, would be stepping down from that post. Rollins reportedly spoke with Bachmann last Thursday and discussed his growing concerns about his health.”
more http://www.nationalreview.com/corner/276300/bachmann-rollins-kind-yoda-robert-costa
Interestingly, Bachmann, very much under the radar, has spent much of the late summer tending to family concerns. She sent two daughters off to college and assisted them both with moving in, from going to Walmart to buy supplies to lifting boxes. This was time away from the campaign, “home economics,” as one source put it, which she did gladly, but it was time, however brief, spent away from the trail. With her kids studying, expect her to travel to Iowa, South Carolina, and other early primary states at an even brisker pace.
Good for her..now it sounds like she's ready to kick it up a few notches.