A Stunned Visitor - Immature Female Hooded Warbler?

While eating a late breakfast Ellen and I were startled by a loud bang on the window - Oh Oh it must have been a bird. We rushed outside to see if it was dead or not. Ellen had found a dead female cardinal one time, but there was no dead bird near the window. After looking further away I saw what looked like a a fat yellow green plant and realized it was our stunned bird. Due to the the heavy rains, the bird was lying on its side in about an inch of water and could have easily drowned. I was able to pick it up and let Ellen hold it as we looked in our National Geographic Field Guide to Birds of North America to see what type of bird it was. Our best guess is that it was an immature female hooded warbler, another option could be that it was a feamle painted bunting. However its beak is less rounded than a female painted bunting's beak.

Help us identify this little bird.