In the film (White's directorial debut), Shannon will play Peggy, the proverbial single woman who lives alone with her beloved dog (been there, done that). As you might expect, the dog dies and Peggy "embarks on a journey of transformation." Now, if this wasn't a script by White, I would be writing very angry things about how she's surely going to find herself a man and really learn to finally live, through his support and love. But that summary, in the hands of the guy who wrote The School of Rock and Nacho Libre? Man, I have NO idea where it's going - which is both rare, in our world of cliched movies, and a very, very good thing.
It sounds like production will get underway when Shannon gets done with Evan Almighty, in which she's playing a supporting role.