The event sequence for all main characters can be found in the walkthrough or at bottom of the wiki page of the character:
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You should be able to find what you need to do next there.
You can buy boat tickets to Amaranthe in a building in Havaria Port, and then talk with the dock worker to get to the island. There you can talk with some NPCs to unlock the private beach. Once the beach is unlocked, you should be able to get the new events with Jeanne when you go to her room in Calterburry.