[It's possible that some of it is just Wirt's anxiety speaking, but with Harry being present in Wonderland, it's true that Lily had gotten a bit more practice with the parental scolding. Of course, the Marauders themselves gave her plenty of opportunities to practice, too.]

I'll help you look for him.

[She can't in good conscience turn her back when there's a missing child involved.]

Hopefully this message of yours means we'll have eyes looking out for him all over the mansion, but I'll start searching on the lower floors. I know kids run off, but--

When people's things are gone, it usually means they've left Wonderland, but I'd rather be sure. Just in case.