"Dad, she is Jessica, who disputes a lot."

[sb70012]

Hello,
I have studied most of the threads about the rules of restrictive (defining) and nonrestrictive (non-defined) that-clauses and who clauses but sometimes it's a little bit tricky to detect if the second part of the clause is essential or not essential. I have created three examples:

Suppose that me and my father are looking at an album of my friends pictures.
I say to my father:

1. "Dad, she is Jessica, who disputes a lot."
2. "Dad, she is Jessica who disputes a lot."
3. "Dad, she is Jessica, the only one of the girls who disputes a lot.

Here, do you think [who disputes a lot] is an essential information or just extra to be separated by a comma?


Thank you.