[General] I have a friend who works in

[Phaedrus]

Just to make sure I got it.

1. I saw a girl who studies at the ABC School who is crying. (Is it correct?)

If I take out the girl's part, I need to restructure it as:
2. A girl who studies at the ABC School is crying.

The underlined part in #1 is a defining relative clause but it is not in #2?

In (2), the subject of the sentence is "A girl who studies at the ABC School" and the predicate is "is crying."

Not only is "is crying" not a defining relative clause in (2), but it is not a relative clause at all, or even part of one.