Brahma/silverudd and cream legbar cross = white chick?

[Ylva]

I bought some eggs from a lady with a mixed breed flock this spring, and one of the chicks turned out white. The egg she hatched from was light blue, and she was yellow as a chick (no grey or silver). We named her Elsa.

Elsa’s father is a brahma/Silverudd blue cross (his mother is Brahma, and his father is a splash silverudd):
Edit: her father might be a pure silverudd blue (splash).

Elsa’s mother is a cream legbar, and looks like one of the hens pictured here:

This is Elsa:

She doesn’t resemble her parents at all. I am positive her mother is the cream legbar due to the egg colour (her mother is the only blue layer in the mixed flock), and the Brahma/silverudd is the only rooster in the flock.

I have read a little bit about dominant and recessive white, but I would love some input from you on why she turned out white.

 

[nuthatched]

She looks like a white rock? nothing like anything in her ancestry. Has a straight comb. How very odd. I'm think the brahma isn't her daddy.

 

[Eon69nc]

Those are not the parents of that pullet. Impossible without feathers on legs, comb. body type too does not match.

 

[Ylva]

I agree. But the brahma/silverudd rooster is the only rooster in the flock, and they are separated from her other flocks. The lady I bought the eggs from is puzzled by this as well. She says there is a small possibility that the father is a pure silverudds blue (splash), and not the Brahma/silverudd.

She doesn’t have white rocks or any other white hens or roosters.

 

[Ylva]

Could the white hen come from a splash silverudd blue and a cream legbar?

 

[Ylva]

The egg she hatched from was blue/turquoise.
Edit: I added a picture of the egg she hatched from. I am 100% sure this is the correct egg, as she was the last chick to hatch, and the other chicks were already moved to the brooder.

 

[NatJ]

She's probably recessive white-- that's the most likely one to pop up unexpectedly.

The Brahma-mix could be her father. Because HIS father had a single comb and clean legs, he would inherit those genes, and could pass them on to his daughter.

But if a pure Silverudd Blue rooster was also a possible father, then I don't know of any way to tell which really sired the pullet.

 

[Ylva]

Update:
I crossed Elsa (the white cream legbar/silverudds blue/brahma (?) hen) with my black copper marans rooster Bandura, and tonight their chick hatched. It looked just like it’s mother, but had a black spot on its back and some white feathers on its feet.

 

[nicalandia]

The Sire in question is not Splash but Heterozygous Dominant White, The Yellow Chick with a black spot is proof of that.

 

[NatJ]

The Sire in question is not Splash but Heterozygous Dominant White, The Yellow Chick with a black spot is proof of that.

Can heterozygous Dominant White make an appearance like the rooster in the first picture of the first post?

(I know Dominant White turns black to white, and I know it can be leaky in the heterozgyotes, but I'm not good at recognizing what it looks like when it's leaky.)