I have a leopard gecko who's a little over a year old. 
I've had her for about a month now. I have reptile carpet, a warm hide, cool hide, and humid hide. Also a little bowl of calcium, food bowl, and water bowl. I have a ceramic heater the warm side stays around 90 and the cool side around 78.
She was very curious and friendly when I first got, her now she spends most of her time in the humid hide. 
She was eating fine and then I noticed some weird poop. Then I also noticed that she was getting ready to shed. As she got closer to shedding she stopped eating and kept to herself. She shed fine and nothing was stuck to her, but she wasn't really eating(this was about 2-3 weeks ago) I took her to the vet and they said she looked and felt healthy, but gave me a mixture of medicines to perk up her appetite and to move anything through that might be taking longer. She will eat a couple crickets, but her poop still doesn't look normal(kind of mushy and not really seperate stool and urate). She just sits in the humid or warm hide most of the time, even when I put food in front of her, and her tail isn't fattening up.
But when she does move around she definitely seems to have energy and isn't lethargic. I also took in a stool sample and I was told there were no parasites. 

I'm just concerned about her because her stool still doesn't look normal and her tail is not fat (wouldn't say skinny) and not getting bigger.
I'm just wondering if anyone has any advice.
Thank you in advance!