Uncanny X-Men writer Brian Bendis talks to IGN about this development.
"She is recruited by Maria Hill who finds herself between a rock and a hard place as far as the growing chaos of all things mutant. New mutants are popping up all over the world, the original X-Men are running around, and Scott Summers is hard at work at some kind of mutant revolution. Scott Summers has publicly spanked the Avengers and has no problem calling everybody of authority out on their BS in the international media, plus somebody is using the Sentinel program to attack the mutants as they appear.
That's why she's [Dazzler] a perfect candidate. She's on nobody's side. She is looking at this with eyes wide open. Even though her relationship with Cyclops has been very good in the past she doesn't know how she feels about what he has turned into. Dazzler's previous relationship Scott Summers is part of the reason Maria Hill recruited her."