Nope, i tried because i did exactly the same thing! I was less smart and tried to sell it back to her (one of my first actions in the game) thinking one soul gem looks the same as another! :%
And you can't return it as such, because she hasn't realised it's gone, if that makes sense. For example, if on her trip down the hallway you talk to her, she stops and stays there the rest of the game and doesn't even go back to her desk. You can just put it back, but we both know that's not the smart thing to do
Plus i presume that because you stole it in the first place (and violated guild rules) even if you could return it to her properly, it would still get you kicked out i should think.
That's the price for being a criminal [img]tongue.gif[/img]