Is this your photo or one taken from the net? if it is not your photo it could be that another hen layed in the same place this hen did , they do that ya know.For me this peahen must be a Blue peahen ( phenotype totally Blue with no signe of BS ) and muts be split BS.
On the other hand,the father MUST be a Blue BS or a Blue split BS.
If this peahen was cross with a pure Blue peacock all the peachicks will be Blue and some of them Blue split BS.
The phenotype of this peahen shows any signs of BS peahen ?