Some of my girls slept standing off and on...other just fell asleep standing up and either fell over asleep or their head fell to the bottom of the brooder like a brace. they were hysterical.
I believe you can give her like 1 drop in her beak and put a few drops in her water....do a search for poly-visol or poly-vi-sol some of the old hands have posted the information and amount previously.
Edit to add from another post:
I use the poly-vi-sol with any chick I have that seems weaker than the rest. I would give her a drop now and then again in the morning. Just put it on the tip of her beak until you see her drinking some of it. You may waste a drop or two because she wont open her mouth for you but her instincts will eventually make her open it a little bit. Enough for it to drip in anyway. Just dont squirt it down her throat, you dont want her to drown. If she gets a little more than a drop, dont worry about it, no big deal.
Sprinkle some starter crumbles on the floor of the cage for her and scratch at it with your finger to entice her to start eating it. She really needs the high protein of the crumbles now.