sounds like she's fine. I wouldn't worry one bit. As long as you've cleaned it up so the others don't see any blood and she's quit bleeding, all should be ok
I don't know about the clotting powder but the styptic pencil burns. Sometimes a bloodfeather can act as a syphon and slowly drain and weaken a bird in a very short period of time. In parrot aviculture it's recomended to pull a blood feather, especially in a flock situation.