S.H.
Yes, she could be depressed.
And homesick.
And sad about it all.
She seems to think that the move was because of Daddy's decision.
She is young, they don't think or feel, like adults do. And they do not have coping skills. Keep that in mind.
Don't scold her for it.
She is having a hard time.
Poor thing.
Take her to the Pediatrician.