Give it to her straight out,but nicely. Like calmly point one out, explain how she is wrong and then give her the correct answer. Repeat
Answer:
If you were writing it as a proper noun, yes.
Explanation:
If you wrote 'I admired the Appalachian Mountains on Tuesday,' then yes. If you wrote 'I like to look at Mountains,' then no.
A paragraph is a distinct section of a piece of writing