She doesn't have her key any more, and has to knock.
Charlie takes a minute to answer the door. "Hey, Bells," he says. "Elizabeth, Chris."
"Hi," says Chris. She looks at Isabella, seeking cues about whether she should be the one to start explaining.
James had to stop holding Isabella's hand to get out of the car and is now not quite sure whether to start again.
"It's complicated. And hard to believe. You may want to sit down."
"Elizabeth and I went to explore the abandoned house by the edge of town and in it we found a portal to another world where time runs differently. We were there a decade and a half. We grew up. Then it spat us out back into our previous bodies later the same day we left."
"I believe them," volunteers Chris. "Bella has a magic notebook, there are pictures, it was very convincing. And I already knew magic existed; I have a useless and inexplicable magic chess set."
Bella looks for a comparable set of pictures of her, over time, the way the knightings make a good sequence for James. She comes up with a series of photos of her on Queensday, hands the notebook to Charlie.
"Magic ones. I had a thing that took pictures and would transfer them to paper. I don't have any of my stuff except the notebook now."
"We helped overthrow the witch who was ruling the country and we took over in her place."
(James smiles, wistfully. They were such a good King and Queen of Narnia.)
"...if you want to call me Bells you can, just, introduce me as Isabella."
James decides not to introduce any of her own name-related complications to this conversation at this time.
"We couldn't get back," Isabella goes on, "so here we are, but I'm not really ten, anymore."
"Also we're married. Chris is probably going to move to Phoenix so we don't have to be apart most of the year."