Go to a feed store. They have food for ducklings. And unless you plan on chewing up the worms for her I doubt she is old enough to eat them. lol Otherwise it sounds like you kinda know what you are doing. :)

worms, corn. you can get him duck food or chicken feed at a tractors supply company some place like that

Brown bread.

I've unexpectedly had to take in a wild duckling, I was far from prepared to look after him. We've not got him a really cosy wooden box with bedding, water and a lamp... We're not 100% on what to feed him and need help quickly?