I'm very sorry, I know this is hard. Never easy to have a hurt animal. How much suffering is going on, how much time you want to put into her, all choices and judgements you have to make. It's very hard to make a judgement from a still picture on the internet. In general, I will give them 24 hours and reassess (assuming that the injuries are not obviously unsurvivable). Does she have injuries to the ear area on both sides of her head? Hard to determine from the pictures. Just wondering if she may have been bitten or squeezed there which would possibly be pretty serious. I tend to err on the side of time, since it's often hard to know and they can bounce back from some awful stuff. If a bird has some fight in it, I tend to give them a chance. Time and patience is often the hardest thing. But if you legitimately think that she's suffering and there is not hope for recovery, then the decision to end that would be understandable. We all give advice based on our own experiences, but each case is individual, every situation is different, and ultimately the owner has to make the decisions on what the right thing to do is.