Yep, this is it! I do hope you enjoyed this sketch of an idea. This part may not be canon-compliant, because I haven't read it for a few months and can't completely recall this scene.

They came to the camp of the Narnians and looked curiously around. Such a small group compared to their previous experience with Narnia; it reminded Lucy of before the Golden Age, while they still fought to conquer Jadis.

Her gaze swept the camp, and then it stayed on someone she hadn't seen for a year - or many years by Narnian standards.

Someone very familiar.

She began to run forward, crying out a name as she ran towards the beloved owner of it, even while her mind reminded her that things were different now, and yet he was still the same -

"Reepicheep!"