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Wasn’t that Roderick Spode’s pen name? It’s been a while since I read any Wodehouse, might be time again.

Right church, wrong pew. She wrote the books that Jeeve's suggested Bertie read to Bingo Little's wealthy uncle to soften him on the idea of marrying down. It turns out that the waitress he fell for was the the real Rosie M. Banks doing research, and they ultimately married. Somewhere along the way, Bertie pretended to be the writer of the books using a pen name. That failed spectacularly.

Lord Sidcup, Roderick Spode's alter ego was "Eulalie Sisters", a lingerie shop he designed for. It was not common knowledge, but Jeeves knew and told Bertie so that he wouldn't get turned inside-out. Spode didn't want the word to get out, for as Bertie said, “You can't be a successful dictator and design women's underwear. One or the other. Not both.”