I was confused about exactly how Amara regained her human form. Alice and Cyrus were on the way to return the water inside Amara to Nyx at the Well of Wonders, but it's the part where they were speaking to the Jabberwocky that confused me. Did they continue on to the well then? Or did something off-screen happen that wasn't explained? How did Amara just suddenly appear out of nowhere in front of Jafar in the castle?
Edit: Just rewatched the scene with the Jabberwocky and Alice, Cyrus and Knave. It seems like there's some implication that she did something to restore Amara to her human form?
I came to the same conclusion - its something the Jabberwocky did or at least taught Alice and Cyrus what to do. Probably, when she probed Jafar's mind, his fears revealed how Amara could be turned backed.