While setting up a student, I accidentally clicked on the wrong interface language. How can I reset?
Here's a link to a Duolingo Support page that outlines how to change the language. https://support.duolingo.com/hc/en-us/articles/204644534-My-account-is-in-a-language-I-do-not-understand-How-do-I-change-it-back-
So her home page and everything displays in Dutch, but she needs to see info in Spanish while studying English.
Probably you selected the course "English for Dutch speakers".
Use this help text to add the course "English for Spanish speakers"
or use the direct link to the course "English for Spanish speakers"
and click the button [Begin cursus]