If your bird has not been eating/drinking for 7 days,she is very weak,and could die from starvation. She needs to be tube fed,often when birds are ill/injured they will not/cannot eat,after a couple of days of not eating they become lethargic(trying to conserve whatever energy they have left)and then die from starvation.
This is where in my opinion birds are fragile,they often will not/cannot eat after an injury/illness,their body starts to shut down and they slowly starve. Birds have a very high metabolism their bodies burn up food very fast,b/c of this they require a constant supply of food to fuel their body,not food,no energy,and they just perish.
Tube feeding kickstarts their body,snaps them out of this lethargic state they go into.
While i really do not know what is wrong with your girl,i have seen these symptoms before in a chicken that had a concussion due to a peck to the head. He was tube fed for approx 7 days,and is now perfectly fine.