I’m really new and I have no idea what I’m doing but my mallard duck seems weak and she’s sleeping a lot and barley eating or drinking. I’ve tried giving her watered down oatmeal, watered down boiled egg yolk, and watered down feed. I genuinely don’t know what to do. She’s about a few days maybe a week old now and she’s a rescue
I'm so sorry your duckling isn't doing well. I do not know much about ducks and cannot offer advice, but hopefully someone else can and will come along soon. 
Glad you joined.