[4] Stineman was born in Cincinnati and named after the character Galadriel in The Lord of the Rings, which her mother read while pregnant.
[2][6] She grew up in Northern Kentucky, where her father was a tennis player as well as a teacher and her mother, a nurse.
It was during her time at NKU that she became involved in student films and eventually signed with a couple local talent agencies to pick up extra money.
[7][8] Stineman moved to Los Angeles after graduation and made her debut in Fame (2009) as a dancer.
She played Audra in Junkyard Dog (2010) and Cassidy in The Middle (2012–14) She also provided the voice and motion capture for Ashley Brown in the Sony Interactive Entertainment video game Until Dawn (2015).