I have a 12, getting too close to 13 for my liking year old and Next and Debenhams are long gone. She thinks it's too babyish for her
She likes H&M, some stuff in the size 6s from Topshop, Primark, etc and like Gradually above, we have a whole lot of compromise going on
She's not a skirt/dress fan so I don't have that issue, she usually wears skinnies with a top and Vans/Converse/Uggs/ankle boots
We've had a bit of a chat about skinnies/leggings and shorter tops (I hate the look of skinnies/leggings with very short tops and I bought her a load of longer vest tops which she layers under the tops
Actually, layering with longer vests have solved a whole load of arguments
She has a couple of shirts that tie at the front, but they're still long enough to cover all areas
Her current wear-to-death outfit is a pair of light blue jeggings, with a flowery Primark short but loose t-shirt, which she layers with a longer vest underneath. Either that or black skinnies with a big old slouchy jumper, which again she wears with a vest top
She prefers shorter shorts, which are fine if there is no arse cheek hanging out the bottom and she's teemed it with a suitable length top or put a longer vest on under the top.
My rules are no arse hanging out of shorts, no inappropriate slogans, nothing padded in the bra department, longer vests to be worn under short tops, no undies on show, and I reserve the right to put my foot down just "because". I have said no to a few things, a padded bikini top being the most memorable and high heels that made my feet ache just looking at them, but generally she's quite conservative with her tastes
It is hard at this age, she had her own ideas and tastes and she wants to keep up with her mates so I've had to pick my battles