Got the idea for this scene from the BBC version of The Lion, the Witch, and the Wardrobe. On one hand, I liked how it portrayed the passage of time from when they discovered Edmund was missing to when he actually reached the Witch's castle, with the sun setting and the scenes showing Edmund's progress, unlike the Disney version, which basically had Edmund there in a matter of minutes. That said, that made it even more annoying how long it took them to leave. Like, seriously, Mrs. Beaver, you're supposed to be running for your lives from the Witch and her wolves, you have bigger things to worry about than the fate of your sewing machine. Slightly AU scene where they are much better prepared and things are explained a bit more.
"Well, we can't outrun the Witch, no matter what we do, because she'll have her sled and we'll be on foot," Mrs. Beaver said.
"So we've no hope?" Lucy exclaimed.
"Of course there's hope. We may not be able to outrun them, but we can keep out of sight and go by ways they won't expect."
She paused momentarily in her preparations, double-checking the contents of six bags she had packed the moment Mr. Beaver had come home with news of Lucy's coming. She shook her head and resumed her work before continuing, "Besides, I don't think we need to worry about that just yet. Your brother has to reach her first, after all, to tell her where we are. It's a fair distance and the weather doesn't look promising and he doesn't seem like the most active sort. He can't have gotten too far yet."
"Then why can't we just go after him?" Peter demanded.
"Wouldn't do any good, I'm afraid," Mr. Beaver put in, as he passed out their coats and boots. "If he's met the Witch and eaten her food, then he's under her spell, and even supposing we could overtake him and drag him back here, the moment we let him out of our sight, he'd just go running back to her. All it would accomplish is making him more set against you. No, the only way to break the enchantment is for him to see for himself what she's really like.
"Now, our best hope is to get a move on and pray for fair weather and safe travels for us, and long, hard trip for him. Understand, I don't wish your brother any harm, but I pray the wind and snow might always be in his face, slowing his steps and getting him turned around now and then, so that he doesn't arrive at the Witch's house a moment to soon."
"Amen," Mrs. Beaver exclaimed.
"I just can't believe he would do this," Susan exclaimed as she buttoned Lucy's coat.
"Can't you?" Mrs. Beaver asked mildly.
"Now, look here," Peter began.
"Calm yourself, dear, no offense meant," Mrs. Beaver replied. "I won't say it isn't bad, but I do think there may be some...extenuating circumstances in the case. I don't suppose he knew she was a witch at first, and he couldn't have known about the prophecy. So he comes across her, and she says she's the queen, and perhaps she asks him what he's doing there and he says she's looking for you, so she wants to meet you, which seems a reasonable enough request if she did promise to make him a king or a prince or something, because you can't just give someone a position like that without knowing where they come from and what sort of people they are, in case they're a bad sort. And besides, he is only a child, and you know there have been many older and wiser than him who have been taken in by the Witch."
"True enough," said Mr. Beaver. "No, it's not our place to condemn or excuse him. That's Aslan's business. I don't know, but he may grow up to be a fine, upstanding man yet. Or he might not. Now, let's get a move on."