8 is a funny age, OI -- they get odd little bouts of hormonal moodiness. But young enough to mean you've got the chance to make your relationship closer before hitting the whole teenagey thing.
I'll ask dd1 when she comes back from school what makes a difference to her. From my perspective, I think the fact that she feels understood and listened to are important -- I can usually tell when there's something up with her, and will try to extract it. She's not a pushy or demanding child, and often won't volunteer when she wants or needs something, so I spend quite a bit of time letting her know that it's okay to ask for things (not just material stuff), and the worst I can say is No, and I won't be cross with her for asking.
I also try really hard not to overburden her with childcare for ds and dd2. And to make it clear to her that I really appreciate the things she does do (she'll often bath dd2 and get her ready for bed, for example, or help ds with his homework -- and he tends to need quite a bit of help, so it's quite an undertaking). In return I'm quite generous with her in terms of privileges and money, on the basis that she's making quite an adult contribution to the running of the domestic setup. We also do have occasional days or afternoons out together, and if I have to eg. take her to the orthodontist or for a music exam, I'll often take her out to lunch afterwards. So a combination of letting her know that I value what she does and that I enjoy her company for its own sake. I think between 8 and 12 is a real shift towards a more adult relationship, and it's worth getting right at that age, as I suspect it's harder to pick up later.
FWIW, dd1 did the dressing like a boy thing for years, from about 7 onwards. By the time she was 10 she looked as if she'd just been pulled out of a skip most days. But I remember my mum giving me a massively hard time at a similar age about my choice of clothes, so I swore to myself I wouldn't repeat that with dd1, and stuck to it. Thinking back, she did quite often ask my opinion, and I do remember saying a lot, "Well, it's not my favourite thing, but you've got to wear it, and if you're happy that's fine." I also spent a lot of time talking through choices with her, eg. "Well, if they're teasing you about having hairy legs, you can either ignore it, or you can wear trousers or tights to cover it up, or we can do something about it. You have to decide which you want to do."
hth my mum was quite emphatically not a good mother, in general but to me in particular, and I've worked quite hard to not be in the same situation with my own dc. I think there are issues specific to girls, but probably also very variable according to the personality of the particular girl I suspect my issues with dd2 at the same age will be completely different!