She is the younger sister of Johan Hilldén who was born in 1986,[3] both siblings grew up in Mölnlycke, about 10 km (6.2 miles) from Gothenburg.

Hilldén's maternal grandparents, Mary & George Hopkins, were both singers in a church choir in Karlskrona, Blekinge.

[1] Hilldén's first musical was the adaptation of Victor Hugo's Les Misérables, which was played in Swedish at the Wermland Opera in 2016.

[4] While still working at the Malmö Opera she played minor roles such as "Bex" and "Natalie Goodman" in the Swedish versions of Everybody's Talking About Jamie and Next to Normal, respectively.

Hilldén has also played minor parts/roles in several other musicals such as Festkväll (English: Party Night) at the Gothenburg Opera, A Talent To Amuse at St. James Theatre, and Curtain Up!