How big is your crate? If the crate is big enough for her to poop in one corner, and then scuttle over and sleep in the other corner, it's too big.
Also - do you have any bedding / blankets in there? If yes, take them out - she can use that to hide her poop.
I also think you need to put more positive reinforcement on her when she does poop OUTSIDE!!! Make it a poop party LOL ... seriously, praise her like crazy when she does it outside.
Another thing you can try is bring her outside - tell her to go poop (or whatever it is you want to say) ... let her walk around and sniff for a few minutes and if she doesn't go, bring her back inside. Keep her close to you (not in the crate), and then try again in 5-10 minutes. When she does do it, praise praise praise.
You might have to do this 3-4 times ... but it will help your pup get the idea of what you expect from her with the command, and that it's to be done outside!
Marion’s Zoo-Kyleigh, Raylan-cat, Echo-TAG,