Hera is the daughter of the film director Hilmar Oddsson and actress Thorey Sigthorsdottir (Icelandic: Þórey Sigþórsdóttir).

She joined Da Vinci's Demons in 2013 as Vanessa Moschella, an outspoken Florentine barmaid and occasional model for Leonardo.

In 2015, Hera appeared in the period drama film The Ottoman Lieutenant, playing Lillie Rowe, a 20-year-old nurse from a prominent Philadelphia family.

Around the same time, Hera played Tanja, a Serbian agent disguised as a housemaid alongside Ben Kingsley in Brad Silberling's film, An Ordinary Man, which was later screened in 2017 before being released direct-to-video in June 2018.

[8] In February 2017, Hera was doing a play in Iceland when she heard about Peter Jackson’s film, Mortal Engines, based on the novel of the same name by Philip Reeve.