Kids are placed by age here, full stop. They will work with her abilities and give her appropriate work.
I do remember 1 or 2 kids at my school who were either held back or put up a year, so it's not completely unheard of, though it is uncommon.
One of the boys in my brother's primary school class repeated either Reception class or Year 1, and I'm sure there was a guy in my year at secondary school who should have been the year above, going by age.
Also, there was one girl in my secondary school who was put up a couple of years - she got her GCSE's at 14, her A-levels at 16 and was accepted to Oxford at 16. She took a year out first though before going to university so she would be closer to the age of her peers.
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