I don't think she's a SL Brahma, I know the guy that developed that variety and they don't look anything at all like that. If she has Brahma in her it is a distant mix.She looks to have relatively good lacing for a mix. I see a raised comb. Is it possible the comb was frostbitten and damaged so that all the points from a single comb would have frozen off? Or maybe she is a Silver Laced Brahma? I can't get a good look at that comb.