It looks like it needs more membrane cleaned off, first. Give it a sponge bath with hot water (the temp you feel is a hot bath to you would be perfect, if you don't want to take a thermometer to it, but birds' body temps are generally 105 to 109). Stick it back in the incubator to dry off. Once it's dry, if the wing hasn't gone back the way it belongs, you can use a self-stick gauze (like Coban brand, or sports tape, that onoy sticks to itself), take 1 inch wide strips, gently lay the wing down the way it belongs, and wrap the wrap over the wing and across its body along the abdomen, to hold the wing still while it heals. A non-food color would be best, like white or black or even yellow, not green or red.
Be careful not to make it so tight that it interferes with her breathing or eating. Also watch out to make sure the others don't try to tug it off of her. And just keep a close eye on her to make sure she's eating and drinking and moving in and out of the hottest areas of the brooder.