D.M.
iT SOUNDS LIKE STRESS AND JEALOUS A THING.
i KNOW A FAMILY WHO HAD SOME DAUGHTERS WHO WOULD NOT POTTY TRAIN TOTAL TILL SIX YEARS OLD.
sCHOOL WAS THE MOTAVATOR.
nO SCHOOL IF THEY DID NOT POTTY TRAIN.
i SUGGEST YOU AND HUBBY FOCUS ON a thing she wants and likes and see if this will motivate her.
tTry spending some alone time with her also.
Plus if she is say the middle girl or only girl then she may want to be Momma or daddies girl.
Attention.
It may be medical also.
Like friend found out.
It could be a fear of all her changes and or new life fears and losing her past and \fear of a animal or ?
Ask her if she is upset about anything also.
Hope this helps
D.