Good morning OP,
The issues is obviously niggling at you otherwise you wouldn’t have posted and it’s completely normal to worry about your child’s maturity when compared to their peers.
I have a son who has just turned 10 and although he has lots of cuddly toys in his room they are just for decoration, he doesn’t play with them or interact with them. He has three that he takes to bed with him to cuddle, but he doesn’t talk to them or act as though they’re real.
I have to admit that if he was treating his cuddly toys in the way your daughter treats her dolls I would find it strange. I only have sons though so her behaviour may be more of a trait in young girls with their nurturing side coming through. I’m not meaning to be sexist but the reality is that girls typically play with dolls whereas boys don’t, so obviously their play behaviours will be different.
In terms of maturity and what my 10 year old son does, he’s generally into his sports, going to youth club, reading, imaginative writing, board games and some iPad games he plays with his younger brother.
I do sometimes see other boys in his class who seem so much more mature than him, but maturing occurs on such a large spectrum that I try not to focus on it. It’s like puberty, it happens at different stages for everyone and even if your daughter does seem childlike now, the point will come where this starts to change.
Some boys in my son’s year are already swearing, making inappropriate comments about girl’s appearances, obsessed with getting the latest “cool” hairstyle, playing on mobile phones, having designer clothes and generally being loud and boisterous whilst hanging around the streets and I’m so, SO glad my son isn’t like that.
Your daughter sounds lovey even if she is exhibiting behaviours that may not be the ‘norm’ for girls her age. She is obviously liked by her friends and does lots of activities and so I would try not to worry.
Most importantly she sounds happy so I would just let her carry on in her little bubble for as long as you can because when the maturing stage hits her, no doubt you’ll be pining for these days.