Who tells Calypso what Zeus wants and What is Calypso's reaction?

Hermes flies in and tells her. Calypso becomes furious at their request and calls the gods jealous that she was sleeping with a mortal man when they slept with mortal women all the time. She still helps Odysseus leave, however.

Athena was the one who wanted Odysseus off the island, not Zeus. Zeus simply complied with her wishes.