Si, es una maestra en la escuela.

Question

What does this translate to in English? And should I use ''hey'' instead of es'

Answer 1

The correct Spanish should be "Sí, es maestra en la escuela." The article isn't needed when stating a person's profession, unless the profession is modified with an adjective or the like. The translation is "Yes, she is a teacher at the school."

I don't understand what you mean by "And should I use ''instead'' of es'"

Answer 2

Hey is an English word, and is "oye" in Spanish. Professions always take the verb ser.

Or do you mean "hay"? That would mean "Yes, there is a teacher at the school."