One cat was attacked by a coyote (and lived). Now the other cat won't stop hissing at her!?

Our older cat was attacked by a coyote (actually, I have suspicions that SHE might have attacked the coyote!) two weeks ago. She survived, a little bruised, but nothing major. The younger cat won't come near her--hisses and growls when she catches wind of the older cat. They used to be great friends. Should I bathe her? Or just continue to wait it out?