Now that Karana is certain she’s getting off the island, she can say outright that she’s ready to be around other people. This isn’t something she’s been able to voice before, presumably because acknowledging her loneliness would make it harder to bear. So, it’s extremely difficult for her when the ship moves away without her. She’s now lost the chance to get off the island. And given how long it took for this ship to return for her, there’s no telling how long she’ll be stuck here.