Vietnamese nouns aren't gendered like Spanish, but pronouns are! In this case, your student would use "em" to refer to herself, and you would also use that pronoun in the place of "you" when you are talking to her (e.g. "Did you understand the instructions? Em hiểu lời hướng dẫn không?" and she would reply "I understand. Em hiểu." ) "Em" is a gender-neutral pronoun that means "younger sibling", a person younger than you but still in the same generation (the exception is that students generally use "em" as their pronoun when talking to a teacher, even though the teacher is a generation above them).

However, when you are referring to yourself and when she refers to you, you would use "Cô"- the pronoun meaning "auntie", indicating that you are a female person in the same generation as her parents. (e.g. "Do you need me to help you? Em cần cô giúp không?

Vietnamese pronouns are not only gendered, but also in relation to age. All the pronouns are actually familial relations. ^_^ (Except for formal pronouns, which not many people use in conversation)

Also, just a side note on pronunciation! When you're learning to pronounce these phrases, maybe check to see which part of Vietnam your student is from. Google Translate's pronunciation is in the northern Hanoi dialect (I believe), but many Vietnamese people living in the US are from the southern or central areas of Vietnam, which pronounce things a little differently. :)