A standing, side profile photo will be helpful. Also the bird's age.
Where are you located? And where did the bird come from? Hatchery? Farm store? Backyard breeder?
Is she laying yet? If so, what color?
As a *general* rule in the USA, a blue chicken from a hatchery or farm store that has yellow soles on it's feet is a Sapphire Gem and one with white soles on it's feet is a Blue Australorp. But there are also colored "egger" mixes that come in blue and may not have any distinguishing characteristics in their looks to set them apart.
Additional photos from different angles, particularly in natural light, and some close ups of the feathers, especially on the chest could clear up another possibility. I don't see lacing on her feathers, which a blue bird *ought* to have -- though some blues, especially palers ones, don't have good lacing. Neither do I see the dark head that females of the blue breeds are supposed to have.
Here's one of my paler Blue Australorps for comparison:
You can see that even though her coloring is lighter than ideal, she does have noticable lacing and a darker head.
Here are two of my better-colored Blue Australorp ladies (a little out of focus but you can still see the dark heads and the lacing):
And here is the reason I'm asking these questions, Silver, who managed to masquerade as a Blue Australorp for about 9 months but who was eventually revealed to be a Lavender Orpington when her feathers showed the common lavender problem of shredding:
So, what I'm wondering is if your bird *could* be a Lavender Orpington -- if she has white feet, a pale color, no lacing, and a head that isn't significantly darker than her body.
