wounded with blood all over her?

[happycat]

I saw a dark spot on my cockatiel and when I looked at her I noticed she had dried blood all over her. (Next to her foot, on her bottom but not coming from her vent) There is blood on her feet and dried blood on her perch. She has a broken nail. She was not actively bleeding when I found her and it has completely stopped. Eating, drinking, pooping, and acting as normal.
I think somehow, my other parrot must have attacked her. He can be very aggressive forwards her so I don't usually let them hang around each other, but it is possible he could have attacked her when my sister was taking them out, and she didn't notice? I'm not sure, but I can't think of anything else that could have wounded her. (Cats are NEVER allowed in the room)
It is 12:00 am so I can't take her tonight, but we will tomorrow. I'm just concerned.. any advice?

 

[BoomBoom]

Sorry to heat this. I'd wipe the blood off all perches / toys so when she starts bleeding again, you'll notice. Have styptic powder on hand to stop bleeding (I think some people use starch). Next, I would check the cage in case her nail got caught on a toy / fabric / sharp metal etc. Just to rule them out as the possible cause of accident so as to prevent it from happening again.

Best of luck, hope she feels better!