Are we talking both urination and defecation? If she will at least pee outside, that's good. For the poop, I would use a suppository (when you are sure she needs to go!), and hopefully that will compel her to do it outside, at which point lots and lots of praise!!! If it works, I would continue along those lines until she starts getting the idea. The best time to start this training is a time when you don't have to leave her for a long period, e.g. a weekend when you are home. (I had a friend with a cat that would only use the litter box, and would ask to come inside in order to use it, so if she has become used to going in her crate, it may just be habit, and it may be that she thinks that is the appropriate place.)