I can't really see her body or markings that well, but I can say her tail should look like an upside down u and not like that. A few closer pics of the head and body from the side would tell more.
I've discovered today that I like my brahmas even more now. A few weeks ago one of my buff pullets went broody without any eggs to sit on so I gave her 2 old silkie eggs and an old duck egg just to have. Didn't think anything about it till an hour ago when I found a white silkie chick in with her.
Ok people it's time for some good news. In a few days i should be getting a dozen bantam dark brahma eggs in the mail. I bought them from dick horstman.