6 year old DSD is really struggling settling here. She co-sleeps with her Mum and when she stays over her Nan's without her Mum, her Nan will lie down on the bed with her until she's asleep.
She was 3 when she first had overnights here and she settled absolutely fine and we know she was co-sleeping at the time. She then asked her Mum if she could have her own bedroom and for a while she settled fine at both houses. Then for reasons unbeknownst to DP, DSD and her Mum started co-sleeping again and she can't settle here. Often it's 90 mins to 2 hours of us going back and forth to see her before she'll eventually fall asleep. We've tried staying with her a bit, leaving her to it, talking to her. No approach seems to help though.
Does anyone have any advice on how we can help her? DP has tried discussing it with his ex and there really isn't any discussion just a "well what's the problem?" from her Mum so I guess we're on our own figuring it out - or not figuring it out as the case appears to be...