"Blue" chickens can range from very dark to very light.
When a hatchery photographs just a few examples, and you have just one, it is easy for the shade of yours to not match the shade of the one in the picture.
For an example of how much blues can vary, I suggest this post in another thread:
https://www.backyardchickens.com/th...res-just-because.1551397/page-2#post-26220660
That poster has Blue Australorps, and the shade of blue is ranging from almost-black to quite a light gray, even though they are all the same breed and variety. Any blue breed can have individuals that are anywhere in that range of shades.
(Yes, your chicken might be an Australorp. I think Blue Sexlink is more likely just because they are more common, but I don't see any traits that would make her definitely one or the other.)