[Cody]

No it is not common, I would have her seen by an avian vet to determine what is going on. I cannot tell from the pictures if the blood is coming from the flesh area or the feathers themselves. When feathers are new and growing in they have a blood supply and if the feather breaks you will see blood. If it is coming from the fleshy skin area, she may have been picking at the area. Information on Blood Feathers

 

[Cody]

I am not sure if I am seeing it correctly but in one of the pictures it looks like there may be a broken feather, if it was a blood feather the blood may be from that, please keep us posted and if you see any active bleeding you must stop it immediately.

 

[Cody]

Does she have toys to keep her busy, you might want to try getting some things she can shred, my birds love tearing up these bird kabobs if you can get them where you are, I get the original size https://birdkabob.com/ in the US you can get them at some large chain pet stores and on Amazon.

 

[Cody]

That still looks nasty, she she picking at it at all? There seems to be a lump where the feathers emerge is that the case?
A lump could indicate a cyst, a tumor or just an area of infection, maybe in the feather follicles. There is a topical ointment called SSD (silver sulfadiazine cream) that may help, ask the vet about using it on the area. This link may help you locate another avian vet https://theparrotsocietyuk.org/site/files/resources/avian-vets-2.pdf Please keep us posted on her condition.