Road shoes - sizing?

About to order some shoes for my daughter and a bit confused by foot size/shape. Considering the Adidas Karma or the Norhwave Velvet
With normal trainers/hockey/football boots, she takes a 38 or UK5.5. However sometimes a 6 or even a 5, depending on brand. Feet are fairly regular shape, neither excessively broad or long/thin.
With my short fat feet, I buy Sidis one size bigger than normal. However with Northwave I think I would buy size for size.
So for her, Adidas in a UK 6 or or Northwave in a 39?
Help!!
With normal trainers/hockey/football boots, she takes a 38 or UK5.5. However sometimes a 6 or even a 5, depending on brand. Feet are fairly regular shape, neither excessively broad or long/thin.
With my short fat feet, I buy Sidis one size bigger than normal. However with Northwave I think I would buy size for size.
So for her, Adidas in a UK 6 or or Northwave in a 39?
Help!!
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