So sorry to hear that It could be a number of things, one she finally gave up the battle, two tube feeding is stressful on a bird so it could have had an affect, Dont blame yourself you did your best. Honestly I had my doubts from the beginning. But no you should never wait that long we r hear and can help when u need it. I was hoping for a better out come but I think it was for the best, her internal organs could have had some permanent damage which could be really difficult to have to deal with. but at least she's at peace now, no more suffering.