When you've done all you can do - though I'd be hesitant to use much chlorine bleach on a color, put it in a bag with newspaper and leave it alone for at a day or two. That has worked with all but one leather purse.
What about an enzyme product like Nature's Miracle for removing pet odors? Nothing tops cat odors. There are several of those type cleaners on the market plus some carpet shampoos have enzymes added.