While I know chickens are flock animals that are usually happiest with their own kind, I have a chicken who was terribly bullied and is now afraid of other chickens. However, she happily hangs out with one of my dogs and my cat.
If you aren't in a position to add more chicks, and if Chloe and Willow form an odd-but-workable friendship, I think she will be fine. Plus, she has you!