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Did the 'broken hip' issue happen immediately? Are there high roosts? How long ago was that?
How long have you been giving tetracycline and, honestly, why? Tetracycline doesn't do anything for joints. It's for bacterial issues, and few at that.
When she turns her neck backwards, is it on purpose of not? ZThe beak clacking - is that her moving her beak to clack it, or are her nostrils congested? Can you hear wheezing (listen to ribs and back, where her lungs are). Vitamin D is easily overdosed. It's not really recommended for injuries at all. How old is she again?
Can she move her feet? Do they have any strength? If you prick the top of a toe gently with a pin, does she flinch? Does she ever move her own legs, even if she can't stand? Does she drink on her own? What was she eating before this happened - exactly: brand name, protein level, label (grower, etc)? Is there any swelling or extra heat anywhere? If you feel her legs, are they rubbery? If you look at them, are they bent? Is her beak at all soft? Not hard like a very hard fingernail?
Did she have access to free ranging? Any access to any feed that was wet, damp, mildew? Any wet corn? Any algae water, ponds, puddles, mud?
First thing I would do would be change the vitamin plan. She needs a more broad vitamin, and E for neurological issues (not D - that's for rickets). Depending on her age and diet, B for possible B deficiency. (Unless her bones/beak are softer than normal or bowed).
Is she a broiler cross? If so, was she fed free-choice?
She should be on an age appropriate feed crumble. 9-16 or 20 weeks (or comb just starts to redden) grower. Comb reddening and growing (in pullets), laying feed with oyster shell.
You can dampen that crumble with water to make a meal. It should not stay in front of her for more than 15 minutes. If so, it goes bad and sometimes birds can be paralyzed from mold exposure. So make a damp mash, then offer free choice dry. How often can you wet-feed her?
The vitamins I would do as follows:
3 drops of PolyViSol in the beak daily, once a day.
Yogurt daily (1 tablespoon in her wet food) daily, once a day.
B-complex tablet, crushed, in her wet food once a day.
E oil capsule vitamin, slit and the contents put into her mouth, once a day.
REASONING:
B vitamins; to eliminate possibility of B vitamin deficiencies (which there are many)
PolyViSol: takes care of the A, D, and some E as well as a little B; given by beak is effective, won't overdose if given as described above.
E vitamin: neurological healing (takes a while - not a miracle cure). 400-700 IU oil capsule for humans. Slit the end, put drops in beak (how many depends on age).
Yogurt: full of live bacteria; helps keep her gut healthy while her diet is 'off'.
Do this for a week at least. Reevaluate. These types of problems, if fixable, take a long while. If you have to buy any of the above, I'd possibly wait til you reply and then I reply back. I'd hate for you to spend on something and then me say "no we have to change that...."
I look forward to your reply and hope that I can help.
p.s. Was she vaccinated for Marek's?