New Leopard Gecko cries when I put her back in her terrarium?

I don't see it as anything you should be worried about. Like any other pet, she needs to get used to her environment. Handling her is fine but don't let her get too used to it because she needs to understand that the vivarium is her home. It would be like getting a dog and letting it sleep in your bed all the time when it should be sleeping in its own. Everyone has their place and your leopard gecko has her vivarium.

Hope I could help.

Leopard gecko crying?

.that does not sound normal but maybe she misses her friends

go back to the pet store and maybe buy her friends to, 1 male and up to 3 females can live in a 10 gallon terrarium