The necromancer's ring quest is missing, it says it's in a forest? But I have no idea where it is and the game doesn't give me any hints.Did you complete the artifact request(s) of Elizabeth, so the Piece of Lirey's statue, the Burning Sword and the Necromancers Ring? Because Elizabeth will tell you to wait, even though you still need complete her fetch quest. After grabbing those artifacts, you should be able to unlock all the scenes with Elizabeth and Eri.
And ignore the hint from Ezra, there is no more content for her.