Blue can come in varying hues, she's definitely Blue.
This is Platinum, it's much lighter in color than most Blues.
The brown you're seeing is most likely due to red influence somewhere in her genetic makeup, if she's from a Marans breeding then that would explain it. What you're seeing is the "copper" from the Marans, it may even become more apparent with age.
There's nothing you can do to "play up" this color, as she matures she may become more red/copper/"brown" colored. If you want Platinum birds, find a Dun or Khaki roo and breed them together, a percentage of her offspring will be Platinum.
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