Hi, my baby girl got hacked somehow. She loves this Adoptme game and has a lot of pets. She was asked by this person to log in with her alternate account and do a trade with her main account. When she did the trade of 3 best pets, they disappeared from her inventory from both accounts. When you go to trade history, it shows the trade between her accounts, but she doesn't have the pets.

How is this possible? What type of hack was this?

Thanks for any input.