If sprained or even fractured, it can take several weeks to heal.
But usually, you will see some improvement. How long did you keep the leg stabilized with wrap?
I usually leave an injured bird with their flock, but I'd consider crating her with her own food/water so she can rest her leg and be protected from the others.
If at all possible, leave her crate in the coop or run so she's near her flock.
Can you see a break, a bruise (green color) or an...