This is the 11689th most frequent Spanish word.
gallega
"Gallega" means "Galician" (a female person from Galicia, Spain) or relates to Galicia or its culture.
In this sentence, 'gallega' refers to someone from the region of Galicia in Spain. It's used as an adjective to describe nationality or origin.
Mi abuela es gallega y creció en una aldea en Galicia.
My grandmother is Galician and grew up in a village in Galicia.
This instance of 'gallega' functions as an adjective to describe a style or origin of a dish, indicating that it originates from Galicia.
Aquí tienes una receta de empanada gallega.
Here you have a recipe for Galician pie.
The word 'gallega' here again serves as an adjective, specifying the regional type of food offered in the restaurant, which is from Galicia.