Lisa was released since she and Ed moved out of Suwanee Ga to Braselton which is a good hour further north. It wasn't good for production for her to live so far away. She really isn't an Atlanta housewife when she lives 2 hours north of the city.
While this may be true, the fact is Lisa and Ed did not bring enough drama to the table, I think the producers wanted Lisa to be more over the top and she refused. Living 2 hours out of Atlanta is not a big deal, at least Lisa is actually a "wife", Nene is a wife, Phadra is a wife, while Sheree is single, Cynthia is at least engaged, and Kim is having an affair with a married man, yet the title of the show is "Real Housewives of Atlanta", mmmmm.......so misleading!!! This is the only reality show that I watch, and I love it!!!