She marked her return on Facebook, with a video straight out of a Quentin Tarantino film, buttoning her jacket, arranging her hair and slipping on stiletto heels to heavy metal music. "I'm ready again," she declared to camera. "Let's get this bus rolling."
Mette Frederiksen, leader of Denmark's opposition Social Democrats, was in hospital with food poisoning when the prime minister, Lars Løkke Rasmussen, called a general election last week, and was two days late joining the campaign.
But the 41-year-old has all the momentum, with her left-of-centre bloc starting with an eight percentage point lead, and few doubting that she will become Denmark's youngest-ever prime minister after the election on 5 June.