She likes to show some of her collection of magical trinkets to the Witchcarters when they're not really doing much. She makes Carrotia show the most interest while Falke and Bear don't show much.
Wendy's always wanted children/grandchildren, so that's one reason why she mindcontrolled the kiddos...but why them specifically?
She treats the Witchcarters like faulty code or machines.
Physically threatens them when they don't do their jobs well, then reminds them she still loves them (in other words she gaslights)
She gets Falke a collection of chewy toys because he teethes and she can't do much about it. It's like some of her magic doesn't work on him even in mind control.
Wendy could not care less about what they're like outside mind control. She shapes them based on her own prejudices.