My ex wife has recently moved away with our DD.
I've always had her every weekend until she moved and we have a very good relationship. DD also has a good relationship with my partner and her DC.
DD now stays with us for a week at a time. She has done this many times before in the past. She is always very settled, laid back and happy here.
My ex has said that upon returning to DD is clingy and distressed, following her around the house crying.
Why could this be happening? My ex could be making this up of course. She has mental health problems (anxiety and depression) which makes me worry that if this is true that DD is reacting negatively to this...