sounds like she might be dehydrated and have an injured tail. I'd ask the vet to check hydration and if dehydrated sub q her, and def check her tail possibly xray if they can.
If her tail is injured and being that there was blood present it probably is, she will need an e collar to prevent any more damage.
http://gliderhealth.com/slfmutl/ecollar.html
Keep her warm until you get her to the vet and try to pump fluids into her, a cold glider won't eat or drink much.
After her vet appointment, go over her cage and anything it that could have caused the injury and remove it to prevent any more issues. Look for fur and or blood
Does she have a cage mate? if so separate the injured glider to a hospital cage pronto.
If she does need an e collar ( sounds like she does ) she will need "after care" while she has the e collar on. She will need a water source she can access with the e collar on as well as accessibility to food, we usually use bird silo's for their staple food, and water. She will need a pouch she can easily get in and out of with the collar on preferably low in the cage as climbing will be difficult with the collar on. You will need to clean the inside of the cone as needed and clean her from the neck back as she won't be able to self groom.