'Sounds like' Lauri might be the one leaving Real Housewives of OC based on the episode description and the fact you don't really see her in any previews anywhere:

"The Barneys celebrate their 10th wedding anniversary with an excursion to California wine country, but there's uncorked drama when the Gunvalsons join them. Meanwhile, Jeana tries to reinvent her life in the wake of her separation; Gretchen and Jeff gear up for an auto race; and bad news rocks Lauri's fairy-tale life."