She is very sick, and her not being able to hold herself up complicates things. We will go slowly and carefully and try to figure the best way to treat her.
Did you get all.of your supplies? Please let me know when you have everything and I will give you very detailed instructions on how to proceed. Do not attempt until you talk to me.
for tubing you need a bigger one. Did you get a tube? Promise me that you will *not* try giving liquids or food with just a syringe because it is very dangerous.
You could try some aquarium air line from Petsmart, Petco, or Walmart. You will also need some Kaytee Exact baby bird food and Petsmart, Petco, and some Walmarts sell it. A syringe you can get at Tractor Supply.
Do you have a scale that you can weigh the duckling on? If not, can you get one? When they get sick like this it is a very good idea to start monitoring them for weight loss because if they lose 5-15% of their weight you will have to start tube feeding.
If it were my duckling I would switch...
I would use the cattle stuff instead because that does not have thiamine in it, and thiamine is the B I would use to treat a possible neurological problem.
Check your back of feed and make sure it's not on this recall list:
https://www.fda.gov/safety/recalls-market-withdrawals-safety-alerts/purina-animal-nutrition-voluntarily-recalling-select-lot-codes-purinarrabbit-feed-purinar-turkey