I'm sorry to hear about your bird.
I do see some noticeable swelling in her middle toe/ankle area. As of now, I wouldn't be too concerned of it being related to an infection, although it may not be a bad idea to check her footpad to check for any lesions, indicating Bumblefoot as the swelling can sometimes spread upwards.
More likely, she flew off the perch and landed on the toe wrong, or tripped over something, got in crushed on something, etc.
Really what you'll want to do, for now, is moving her into a pen that reduces her movement so she doesn't further reinjure the area on accident. The area should be soft padded, and free of things she can trip on. Riboflavin (B12) is an important vitamin in chickens that supports healthy leg growth and structure, so she may benefit from a little Riboflavin in the form of B complex for a while.
In addition, you could soak her leg every few days in Epsom Salt water if you want to reduce some of the swelling going on. You could also administer an NSAID, but I would personally hold off on that for a while as pain is what is keeping her from reinjuring the leg. Sometimes when you "over"medicate a bird with an injuring, they feel better, starting walking on the injured part too soon, and reinjure it further.
