I recommend that you lower roosts to 20"-22" above flooring if you havnt done so already. You can place her in a cage or crate with feed and water. Limiting her movement will prevent further injury and heal quicker. You can crush several vitamin B complex tablets into powder and sprinkle it on her feed. The vitamin B complex may help speed up recovery. Do this for 5 days , then release her and see if there's improvement. If not, put her back in the cage and continue the vitamin B complex treatment for another 5 days. If there's no improvement, stop the vitamin treatment, but keep her caged until there's improvement. Leg injuries take time to heal; sometimes a week, a month, or never. Then it becomes a quality of life issue.
I've had this happen to a couple of my BR's on occasion, jumping down from a high place in the yard. Eliminate high places they can jump down from. Mine recovered fully while caged.