Francine left Frobisher because she was a better detective than him. (COMIC: The Shape Shifter, AUDIO: The Maltese Penguin) She told him that he wasn't the Ogron she'd fallen in love with. (AUDIO: The Holy Terror) Francine used the disguise of Arthur Gringax. She produced a product that gained the attention of Josiah W. Dogbolter. The product was a microchip containing a joke. Francine then revealed her true identity to Frobisher. She told him that he'd regret staying with her and not leaving in the TARDIS, and that she wanted to bring Dogbolter to justice. (AUDIO: The Maltese Penguin)