Does she move the wing at all? Or is it just completely limp? When you lift it to look under does it bother her? When you move it does it seem 'loose' or does it feel like the other wing? Sometimes wrapping is good to give it some support while it heals, but sometimes it's not, it really depends on the injury. Without an xray, an outward exam is all you have to go by. If she can use the wing, but is choosing not too, then soreness is probably the issue and I would be inclined to wait a bit longer before wrapping it to see if it improves. If the wing is just limp and she has no control over it, then wrapping might be best. If a vet is an option, then xrays may tell the tale, if it's broken/fractured, or just very badly bruised. This manual tells how to examine for various fractures, and how to wrap or splint. Important not to wrap too tightly and cut off circulation, and also make sure the bird tolerates it. You don't want her freaking out and injuring herself worse.