You love your Speedy so much, its great to see! I think you're right when you say she knows how to hunt. If there's food there, I'm sure she'll find it eventually. When feeding her stuff like worms, you could just try to put them right in front of her, but I wouldn't worry too much. If the fish and crawfish are eventually disappearing and your girl isn't getting skinnier, then I'm sure she's fine!