Guessing, but perhaps 3-5 days with no water was too long, especially outdoors and for something that small. I'd call that underwatering.
I think whatever roots it had were minimal, so they'd pucker up quickly.
That said I struggle with Calatheas much more established.
They do fine for a few months and then crash and burn.
I've been told it's not high moisture they need but high humidity, which is what make me wonder about your outdoor one.
Good luck:)
