What are you trying to ask? Or am I just to stupid to see what you are trying to ask.....
Are you going to the show? i am going to be late. see you in 20 minutes.
I forgot about the show! I’ll be right there!
are you serious? where are you? it is starting.
i’m at the theater.
i don’t see you. are you in the right theater?
i think so... we’re seeing zootopia, right?
what? are you kidding? did you bring your little sister or something? why would we see that? we’re watching zoolander!
i knew that. i’m on my way right now.
The answer is their because "the girls" is plural, meaning more than 1 girl is being addressed. Therefore, the answer cannot be her.
If you don’t know you shouldn’t be answering it