[EDITED for content: 10:15 EST Sat]
Sally, thank you! I'll get right to it, if you don't mind; niceties later?
I'd GUESS 2-3?
I think a tad skinny BUT? Others do not. I am PUSHING the nutrients; there is HUGE backstory, here... I suspected nutritional issues from day one. My vet? Just came up with that, I think, as a Hail Mary: he just didn't know how to help her.
Still? Sadie is the first chicken I'VE EVER SEEN UP CLOSE IN MY LIFE that I wasn't cooking for dinner.
I have absolutely zero frame of reference; and she is a semi-wild born hybrid, so? I'm kinda thinking? In culinary terms? We know chickens by a set of standards: Conformation. My guess? Similar to breed conformation, but truly, no idea.
{I should say semi-feral. She has no wild genetic contributors of which I'm aware}
Since Sadie is a hybrid? Mightn't that throw out the conformation rule book, anyway? We have no idea what phenotypic traits are from which lineage if ANY, except the obvious: feather patterns and features and the breed-specific traits, sorta. She has feathered feet. Barred Rocks, if that's her? Do not. Supposedly? Her father did not either. She seems to have traits that make no sense. Recessive? No idea. And then there's hybrid vigor. Hybrids? Unpredictable, or no?
(I just learned what 'barred' or 'barring' meant, yesterday, FYI. I'm afraid, so afraid, that I am not his best advocate. Except? I LOVE Him. Sadly? Love doesn't move mountains, except in fairy tales.)
Body type, in particular? Musculature? Weight? Proportion?
In ligresses or tions, for example? We can't measure by the 'book'. Very many canid 'mutts' defy species' standards, too.
We just have no idea what NORMAL is, for him.
{Do we? Can we? How? I'm dying to know, so I can help not-her.... Tearing my hair out, trying to wrap my head around this.}
In my opinion:
HEALTHY, bright, strongly pigmented, erect and vital Comb and facial features, eyes bright; and disposition fantastic: spirited, loving, devoted, intelligent; huge talker; I STRONGLY SUSPECT a nutrient deficiency with heritable predisposition toward some, strange syndrome/symptoms/anomalies and/or possible [deleterious] genetic mutation/s.
Feathers? Or is it Plumage? GORGEOUS. Excellent sign.
But Sally? Go back a couple weeks? I'd never even been within ten miles of a chicken. NEVER.
Asking me about anything chicken?
Is like asking Buffy The Vampire Slayer about normal high school experience.
I AM educating myself, or trying to; but I'm SO new. Completely naive. I had never stepped in MUD or a BARN until I moved here, practically. Definitely on the barn one: yes: never.
Terrified of cows, not kidding

emon Beasts. O, I want them to be HAPPY. Just? Be happy elsewhere.
And they're EVERYWHERE, here. I swear? There are more cows than PEOPLE, here. I am SO out of my element. I AM trying. BUt to say I know ANYTHING about a farm animal? I'd be completely misrepresenting reality, and that can not work in Sadie's favor: her best interests, his, are served by my being honest, I truly believe this.
But look at me: I trust the vet who told me she was a girl, for goodness' sake: against my better instincts. Not twice, but three whole times. I did ask; I doubted; I hemmed, hawed. Hencrowing? It's actually a thing, turns out. Fine. Reasonable, given 'her' social circumstances.
And I did further research: crystals, if gout, MAY have migrated to left ovary, I then theorized, based on case studies I read in peer reviewed journals: and kickstarted the right ovary, which, in chickens, is usually NOT used and often has relic 'gonads' in various stages of development, setting into motion a cascade/chain reaction including the release of gonadotropins and androgens, thus leading to 'her' developing secondary male characteristics. Sex reversal in chickens? Turns out? NOT an unheard of phenomenon, either.
I have NOT been idle, on this. I'm trying to learn.
Comb? Spectrum has room for a wide variety of sizes/shapes, etc. So I just buy what they sell me, Sally. Seriously: I know nothing.
Occam's Razor? She's a boy. I argued this time and again. I need to know, too, for health reasons, diet, etc. It's not inconsequential information.
But? THEY INSISTED I WAS NUTS: that he was, indeed, a she.
SO? I know nothing, except that I love Sadie: truly madly deeply, and want/need to help him.