I have a feeling something about her meaning was lost in the message. But maybe that's just unwarranted optimism.

[Because, uh, yeah. Whatever the Keeper thinks they'll gain by exploring on their own, he doesn't get why they can't have a map to direct their efforts. Does she not really want to help them survive? She says to ask her if there's anything she can help with, but he tried that and she refused. It didn't leave a good impression on top of his existing frustration.]

She did say something to the others about how if she dies, if her lighthouse light goes out, someone needs to fill in immediately or we risk all being killed quickly. The lighthouse itself is significant and the light is her lantern.