Pennywise from 'It' is a recurring character. He's a shape - shifting clown that terrifies the town of Derry. Another one is Roland from 'The Dark Tower' series, a lone gunslinger on a long and arduous journey. And Carrie from 'Carrie' also pops up as a memorable character, with her telekinetic powers causing chaos.
Well, it could be that Carly had been thinking about the person for a while and finally decided to reach out. Or perhaps there was a special event or emergency that prompted her to show up or call.