DRSABCD
Danger? - Why is she on the ground? Gas leak? Loose electrics? TRAP?! Make sure it's safe for me to approach
Response - "Can you hear me?", "Squeeze my hand if you can". See if she's responsive
Send for help - Either call with a mobile (which I can't have due to OT) or try to find someone near by who can get help or phone an ambulance
Airway - Is there anything blocking her throat. Vomit? Clear and open.
Breathing - Listen very closely for any breathing. As I'm doing medical training I'd probably grab a carotid and brachial pulse quickly.
Compressions - If she's not breathing and has no pulse I'll start compressions, I won't do breathes because I'm alone and compressions are more important, plus I really don't want to get Hep A from someones spit.
Defib - not really possible at this point.
As the OP's rules means my chance of help arriving is practically nil, I pretty much do compressions til I physically can do no more and she's cold and obviously dead.
If she is breathing and has a pulse, I'll cover her with the blanket and my coat after assessing for any injuries, cuts or bruises that might indicate the source of her accident. I'd be careful not to move her neck and spine in case she has any spinal injuries. But if it looks like shes going to vomiting, I will move her into the recovery to prevent aspiration. Check pupils with the flashlight on my keys. Eventually if I cannot call or wave down someone to get help then I wrap her in the blanket and my coat and carry her towards a hospital, hoping I can wave down a car. Even someone calling the police would be good, because we can get her there faster.
As for carrying her, I have to balance possible spinal injuries with possible overdose. Its crap but if I really can't get any form of help, I can't physically leave her.