Lovely. Suet-pudding, for those who are curious, is a British delicacy made with beef fat. It's not really a dessert, and it's definitely not something you want associated with your face. This statement, then, shows us that Mrs. Wormwood has a warped worldview. She's either too lazy or too stupid to think straight.
She thinks she's hit the jackpot by marrying Mr. Wormwood, "a successful businessman," and been left "sitting pretty in a nice house." It's all right if you don't mind being married to a "twit," to use Mr. Wormwood's own word, and if all you care about are soap operas and Bingo games. But wouldn't a person with some brain cells find being married to Mr. Wormwood depressing?