DESPERATE HOUSEWIVES - "Thank You So Much" - Edie thinks that Karl is going to pop the question, but he's really trying to marry Susan, Carlos learns more about the fractured relationship between Gabrielle and her mother, Lucia (guest star Maria Conchita Alonso), and Lynette learns the extent of Bree's problem with alcohol, on "Desperate Housewives," SUNDAY, FEBRUARY 19 (9:00-10:00 p.m., ET) on the ABC Television Network. (ABC/DANNY FELD) RICARDO ANTONIO CHAVIRA, EVA LONGORIA