Lol, dont underestimate pet store fat tails that havent been handled much. Any other fat tail i have ever seen or held has been a total sweetheart, like they're supposed to be, except for this one fattail that we had when i first started my job at Petsmart a while ago. I didnt know much about reptiles then, but I was cleaning them all one day and we had a HUGE african fat tail. everyone warned me not to pick it up because it was mean, so i scooped him up gently in a net to take him out to clean him. He was very calm and just sat nicely and let me do my thing.
When it came time to put him back in the clean cage, i figured since he was so good when i scooped him, that he would be fine if i just picked him up and put him back. so i gently picked him up, he was fine and everything. I placed him back in his cage and he was fine and sweet. He crawled off my hand slowly and i thought all was fine, but once he got off my hand, he turned around, gave me a NASTY bite, and went under his hide! it hurt like heck and i was bleeding everywhere! he took a nice chunk off my finger, lol. He did the same to the woman I sold him to, too. She had a lot of reptiles, including fat tails already, and this one was very big and had real nice coloring, so she bought him. I warned her it was mean, but of course she didnt believe me, haha.
Well thats my story. Very nice gecko you have, and she looks very healthy! If her poop still smells real bad and your worried, it wouldnt be a bad idea to get a fecal sample checked at the vets, just in case. 
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~Melissa~
1.3 Leopard geckos
1.0 Bearded dragon
1.0 Hog Island Boa
0.0.1 crested gecko
1.0 Ferret
0.1 Chinchilla
1.0 Chinese Praying Mantis
Melissas Menagerie