Sapphire wakes up on... the surface of the moon? It's white and dusty and gravity feels weaker than it should. The sky is dark and she can see the Earth and Sun in the distance. Her right hand bears a glowing indigo ring, her left holds a similarly colored staff.
"Affirmative. Flight plan modified."
She starts to move north as she enters the atmosphere, continuing to slow down. An indigo-colored transparent ovoid bubble forms around her, shortly before the air outside of it starts to glow orange and yellow.
Oh right, flying really fast makes things heat up. It's good that the ring knows to protect her.
Eventually she slows down enough that the air ceases to be on fire, and the bubble fades away. She is now above Long Island, approaching Connecticut. She hasn't previously seen the region from this altitude, but even so, it seems different than what she expected. New York City is noticeably smaller, and a city on the western coast of Connecticut—she thinks it's Norwalk or Bridgeport?—is much larger than she remembers.
That's strange. Maybe she's misremembering? How would a city get bigger or smaller?
A man in a green uniform, with a green, lantern-shaped sigil on his chest, wearing a glowing green ring on his right hand, glowing green, approaches her from below and begins to fly alongside her.
"Welcome to Earth. Identify yourself."
She wants to stop and talk to this person she's never seen anyone flying before. And he has a ring. "Hello my name is Sapphire Eyestone... Did you wake up on the moon with a ring on your finger too?"
"No, I got my ring when the last guy died. I'm not aware of anyone who's gotten a ring that way. That what happened to you?
"It is, I went to sleep last night in my dorm room at Wesleyan, or I think it was last night and I woke up on the moon. I don't think I've ever heard of you before though. Are the rings secret?"
"Nope. I've had this ring for seven years, although I was in a coma until a few months ago, and there are two other green lanterns on Earth. I can't imagine how you wouldn't have heard of us. You have any idea where that ring came from? Or, uh, what kind it is?"
"Are... are other Earth's a thing.... I noticed that New York City looks smaller than I remember from when I was on a plane last. And there's a big city here in Connecticut I don't remember being that big."
He sighs.
"There are alternate realities, yes. We've gotten visitors a few times, it's usually a pain in the ass. Sounds like you come from one of them, that or you lost your memories or something even weirder happened. Can you send me your ring's recordings?"
"Ring can you do that?" She wants to send the recordings it sounds like it might help figure out what's happening.
"Thanks."
Guy's ring projects a green hologram that looks like Sapphire's flight path. He scrutinizes it for a few moments, looks at a few more holograms; graphs and charts, and says,
"Did you send me everything? Because the earliest data here is four hours old."
"All routine environmental recording data was transmitted. Other contents of database not transmitted. No data prior to 4 hours, 17 minutes ago available."
It lists various types of information it has been able to put together in the last several hours—mapping, language data, technical information about how she channels Indigo Light, etc. It's clear that the ring has learned a lot about the things it has been able to observe so far, but doesn't have data about anything else.
"It says that's all it has. It seems like the database is all things it learned in the last four hours. It figured out more than I would have."
"I'm not sure, a part of me wants to go home but I feel like I might be here for a purpose. My ring is powered by compassion and it feels like that's a message like I'm meant to be here to help people."
"Could be. It's a pretty weird situation. I've make some calls, take some scans, might be able to figure out more about what happened to you."
By this point, Guy has exited threat-assessment mode and has noticed he is speaking to an attractive woman.
"Say, I forgot to introduce myself. My name's Guy, Guy Gardner. If you like, later, maybe I could show you around, introduce you to this new world."
He offers his most charming smile, which Sapphire may or may not actually find charming.