She played the iconic villainous role of the Marchioness of Santillana in the television series Águila Roja,[1] which earned her public recognition.

[5] Gallego started her television career playing a minor role in the Galician series Pratos combinados, aired on the regional broadcaster TVG.

[7][8] The breakthrough role consolidating her acting career was her performance in the adventure television series Águila Roja,[5] aired on La 1.

She played Lucrecia, an ambitious and ruthless woman,[5] widowed marchioness of Santillana, whose intrigues carried a substantial part of the plot of the 9-season-long series, ended in 2016.

[9] She starred in the television series Secretos de Estado [es], aired on Telecinco in 2019, playing the character of Ana Chantelle, the wife of the Spanish prime minister.