She licks her finger.
"It's sugary," she says. "Sugary and flowery."
"What does it mean?"
"I'm... not completely sure," says Chris. "Mostly because I can't think of an explanation that makes any sense."
"You don't!" she agrees. "You look like a person. But most people bleed blood, not... sugary flowery stuff."
"Well..." Katie ponders this. "Why do you do that? Maybe something got in the way of my why."
"If something did, I have no idea what or how or exactly what it would've gotten in the way of," says Chris.
"Evidence seems to loosely suggest that you're a plant, because those don't have heartbeats and do leak sweet flowery stuff if you poke holes in them. But I have no idea what that would even mean, because as far as I know, plants aren't the kinds of things that get up and walk around, or think or talk or come in people-like shapes."
"How do you tell for sure if something is a plant if you don't know?"
In a patch of sun.
She'd probably be sunburned by the time the sun went down if - well, if.
Katie comes back in at sunset. She has strawberries for dinner, leaves and all.
On another level, it seems like obvious nonsense that she could be a plant.
But it's also obvious nonsense that she has no heartbeat and bleeds sugar water, and at least that nonsense and the plant nonsense fit together in an obvious way. The fact that it's a silly explanation doesn't mean it's not the best explanation.
So... until she comes up with a better one, Katie is apparently a plant.