She has been described by Pfeiffer as a "wonderfully strange, but brilliant" engineer, and that "She's psychotic with this still, cold exterior that gives the sense that she has no conscience whatsoever". "The perfect executor" to Queen Ingrith's "evil plan for all dominance".
Role in the film
Gerda is Queen Ingrith's personal advisor, assisting her in her secret plan to kill all magical creatures. When Maleficent, Aurora, and Diaval are to have dinner with Ingrith, King John, and Prince Phillip, Gerda announces their presences. After Ingrith provokes Maleficent in a way that causes her to lash out, Gerda shoots Maleficent in the sky when she tries to fly away from the castle which causes her to fall down the water below, only for Maleficent to be rescued by Conall from drowning. Afterwards, Gerda informs Ingrith of what happened and tells her Conall ressembles Maleficent.
As part of a trap, Gerda loudly announces to the creatures of the Moors via loudspeakers that they are all expected to be present at Aurora and Phillip's wedding. She also directs an attack towards the Moors in order to steal Toom Bloom flowers.
Three days after Gerda's announcement, once all the magical creatures are present inside a chapel, Gerda hears Ingrith's order to "start the music". She then plays an organ that releases red iron dust onto magical creatures inside the chapel, which kills them. Flittle puts an end to Gerda's single-handed genocide by going inside the organ's pipes, causing her to leave behind blue flowers that render Gerda unable to resume playing the organ, sacrificing herself. When Gerda tries to get the organ working again, Knotgrass and Thistlewit avenge Flittle by attacking Gerda and causing her to lose her grasp on the organ's pipes, resulting in her screaming as she plummets to her presumed demise.
- Gerda's name is never mentioned in the film itself.