Hello, I have a step daughter who is 8. Myself and husband (her Dad, obviously!) have a great relationship with her and I have known her since she was 4. She never had any issues when we got married and I feel we've been extremely lucky in how positive she's always been with me in her life.
However, over the past few months she's voiced anxieties, some about her Mum meeting someone (she doesn't want her to) and another about us having a baby (as she doesn't want it to live with us full time and not her). I think her starting to have worries like this is reflective of her age, but I also think this is because she feels threatened that the bond between us (especially her dad) would be stronger with a child who was with us 100% of the time. I understand why she feels like this, but of course that would never be the case, and we know she'd be an amazing sister and it wouldn't impact how much we love her etc.
She lives about 30 mins away, we see her around 3/4 weekends and usually one night mid week.
Sorry for long post, but any tips/advice would be much appreciated to make this as easy for her as possible.