This Sacramento Bee story (What’s next for Michelle Rhee, once the national face of education activism?) tells you what you already know: that Rhee has pretty much dropped off the face of the earth when it comes to education advocacy.
What's alluded later on in the piece is just how different (and perhaps much-diminished) her organization, StudentsFirst, has been operating since she stepped down, Pope Ratzinger-like, from day to day oversight.
In contrast to the Rhee era, StudentsFirst under Jim Blew is much more low key, and focused on fewer states (10 vs. 17). The organization claims to have helped enact 40 laws including "a new charter school measure in Alabama, an enhanced charter school law in Ohio and a teacher-evaluation bill in Michigan."
Back in 2012, however, StudentsFirst was involved in a host of state and local races (see below), funding both Democratic and Republican candidates.
Three years later, I've come across little if any sign of them having been involved in any of last week's big races (Philadelphia, Kentucky, St. Paul, Denver, JeffCo, Seattle, etc.). Though I haven't confirmed it independently, I'm told that StudentsFirst wasn't directly involved in any of these races.