Keltham peers at her more closely. "That... could be a change to underlying biology that I interpreted as cheerfulness, I suppose, if you hadn't told me it wouldn't occur to me that your actual appearance had changed." Oh, huh, Keltham has slightly mixed feelings about that he should put a pin into discussing sometime later - should he mention it now so she can help him put a pin in it? - no, that seems like an ominous and unspecified thing to dump on somebody if you're not going to talk about it right away.
Keltham casts Detect Magic, just to see if he can spot any lingering magic on or about Carissa from it all.