This is very worrying it could just be the change over getting her down but I d be very concerned if it was my child how long does she stay for ? Can you or her dad gently ask what sort of thing makes her feel unsafe perhaps a generalised conversation not just about her but about feeling unsafe in general and see what sort of things she comes up with or maybe get her to draw a picture of her weekend with mum and .? Just see if you can pick any little clues up
Hopefully it’s something innocent but it needs finding out just in case....
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