I have a 21 week opal Legbar that I’ve noticed over the past several days was not moving around like usual, more lethargic. I noticed yesterday that she was unbalanced and not standing/walking normally so I separated her and started giving vitamins. This morning she’s even worse and can’t stand or move at all, just leans on haunches and lays down. Is there a chance this is just a vitamin deficiency and not more serious like Mereks? I'm giving her poly v Sol on the tip of her beak since she’s also not actively eating or drinking. Have you had pullets/hens recover from this? If so how long does it take? I need to wrap my head around how long she needs to be quarantined for as it’s a lot of work! Thank you!