Asking interview advice for past bad experience

My wife had an experience a couple of years ago where she was told she was going to be non-renewed. I think it was over personal/ political reasons rather than performance. The principal was focused on gifted kids, could care less about sped kids and openly embraces politics that I find distasteful. My wife had to change districts and has had two years of stellar reviews.

Now she wants to get back in the old district and will be doing interviews soon. When she has to address the year where she was not renewed in the district what is the best thing to say? What does an administrator in the hiring process want to hear from someone in my wife's situation? I would appreciate any advice to help her get in the district. Our kids are in the district, it has a 4 day schedule instead of the five we are currently working around, and it is much better supported.

Thanks for any support.