A "predicate nominative" is a noun or pronoun that follows a condition verb and renames the subject.
...My mom is an engineer...
...Her name is the same as mine...
...She became a lawyer...
Sometimes the predicate nominative is a whole clause.
...The question is when she decided to quit...
...Rosa is what many call a "natural" at this...
...Her house is where I used to live...
There is no comma after the condition verb before the predicate nominative.
Quotes don't change this.
...My question is "Do you know that she was there?"
...What he said was "I am not going to put up with this."
Happy punctuating!
Margie