Liz Summar aka Saleen is indeed Steve's wife & has been the primary contact person within the Saleen organization for owners to receive information on their Saleen vehicles for years, including Team Saleen.
Therefore I consider this story to probably be another of those numerous Internet rumors that are created out of whole cloth & have no basis in fact.
However, I suppose it's possible that she has decided to step away from her responsibilities as the matriarch of Saleen Performance & allow someone else to fulfill those duties. After all, Saleen the Corporation has progressively become less & less "Saleen" & more "Corporation" with Steve being primarily a figurehead than being someone who is actively involved in the daily operations of the company that bears his name.
Of course I may be wrong about this, but that is my impression.