I would advise against doing subcutaneous fluids. The fluids that are formulated for this are 1) a special PH 2) different formulations 3) depending on what you use, a "salt" water can dehydrate worse. Birds are difficult to give SC fluids too..I worked for an avian veterinarian for several years and the skin is very tight, and you have to be very careful where you enter. Besides the correct fluids (Lactated Ringer Solution, Normosol, Plasmalyte, NACL 0.9% or 0.45%) you also need a sterile needle.
Please see if a veterinarian is in your area- there is a link with area avian veterinarians on this site.
As far as blood loss- birds cannot lose much before getting into trouble, hence why a broken blood feather can be an emergency.
If her crop has blood in it, I would hope she would digest/pass the blood...Trying to get it out would risk aspiration of it into her respiratory system. Just my 2 cents. Good luck!