Article with details of syringe feeding
http://www.majesticwaterfowl.org/mmissue76.htm
This shows someone actually syringe feeding a goose.
https://www.facebook.com/MajesticWa...0836389340489/824960470928077/?type=2&theater
If she is taking the sugar and water, I would make some gruel (soak oats in water - the gruel is the water with oat juice in it). At this point calories are good, but a little longer term, too much sugar can also be a problem. Not to discourage you - but this is a tightrope she is on, and balance is important.
Poultry Nutri-Drench can be helpful. I am thinking unsalted fish broth could be helpful as well - it has protein, which she needs. Greens in a blender - kind of a smoothie may be good.
Prayers for you.
I cannot be near the computer most of the rest of the day - if at all possible I will check somehow, but it won't be much if at all till tomorrow.