[3] Mattfeld began her career as a ballet dancer from the age of five and studied for the following nine years under the guidance of Debbie Allen.
[2] She stopped acting after graduating from Long Beach Poly high school to attend the University of Southern California School of Dramatic Arts where she earned a Bachelor of Fine Arts in acting in 2016.
[4][5] In her first starring role, in The CW crime comedy-drama, In the Dark (2019–2022), she plays a blind woman.
For this part, she learned skills for coping with blindness such as using a guide dog and sending text messages with voice commands.
She shadowed a blind person, on whose life the show is based, to observe how she did ordinary things.