Note the girl above .. mine..doesn't have that dark of a beak. Lighter chicken. Buff. If you look up the Buff silky you will see most aren't real dark..here is a photo of a Buff chick like yours. Beak is about the same color.
Now I'm looking at the tail again..hummm.... silkies can be tricky..at times. I used to go by the sweep or no sweep of the top, early on. Plus, the width of the comb.