It`s good that you have advertised her here on the forum in the rehoming section as more members and `lurkers!` will see the ad.
She sounds to me as though she needs a more understanding owner rather than a younger child as children won`t be interested unless they can pick up and cuddle and more often than not, that ends up with a bloodied finger! Given this hamsters past, I can`t say I blame her for wanting to bite, but hybrids have a reputation for nipping anyway and usually require patience, which a child doesn`t understand.
Hope someone comes forward to give her a nice home now. x