Glad she's recovering! I found the recovery was just as quick as the illness took hold!
The liquid amprolium in the uk is a different concentration that works out about 1 tsp per litre water! Good to know its safe and unlikely to overdose because it's all a bit too confusing!
Treat them all as soon as you can. Young chicks can die from coccidiosis very quickly. Mine had it a few weeks back and I lost 5 chicks :(
Hope you can get some corid into them soon.