I have a question about the use of pronouns. The definition is that pronouns are used for substituting a noun or a noun phrase. But in a real-life context, the noun or noun phrase might not be mentioned verbally. If the thing is understood or is just obvious, can I use the pronoun right away?
(My friends and I are at a new place. I point at a woman I don't know )
I: She is so stylish.
My friends: Yes, we should go and know more about her.