Yeah, there's too much stressing over Lucy's size issues in the last couple of strips - as well as making sure Rhoda's size magic gets demo'd - for Lucy not to get shrunk at some point.
OTOH, I don't see it being Catalina's "fault" - she's managed to keep quiet about magic for most of a year after all (Pandora noted shortly before she marked Catalina "last October" that she'd managed to keep her mouth shut about Rhoda's magic, and we're now well into spring at the very least).