My 8yo stepdaughter has been struggling to sleep in her own bed of late. Her dad has shared equal custody of her since she was around 12 months old, no real issues with sleep until lately. She has two very stable families and great relationships with parents and stepparents. However she has been sleeping in her mums bed of late and now really struggles to sleep by herself, bedtimes are a nightmare, tears, not wanting us to leave her alone etc. We’ve talked this through with her, reassurance, cuddles etc, tried lots of the health professional/psychologist recommended tips. She settles eventually but we really dread bedtime now. Our main issue is raising this with mum, there is ongoing animosity (custody was court ordered) mum does not wish for stepdaughter to be here as she does not believe in blended families, and so trying to work together and resolve this constructively means we just hit roadblocks. We really want to work with mum to resolve this but we feel that as long as mum has her sleeping in same bed she will never sleep alone without a fuss, I fear we will eventually have to let her sleep with us. Am I overthinking all this? Any advice/tips recommended. Thanks in advance!