Ascites went wrong
I've dealt with ascites too. It's awful. Assuming you didn't puncture an organ, you probably didn't screw up at all. if you necropsy a bird that's died of ascites, you'll see how severe the damage to the heart and lungs is by the time the fluid begins to accumulate... The truth is, that once you find an asites bird prostrate, it's more than likely too late. Also important to realize that the stress of handling and treating the bird can easily over tax an already weak heart, and lead to an arrest. I'm sorry you're dealing with it, it is not fun.