I didn't know what she was talking about
Then why did you want to find out about it?
She made it sound cool and interesting.
It would've been a lot faster to just ask her what she was talking about.  If you don't know, ask.
I didn't want to show her that I didn't know what she's talking about.
You should always ask if you don't understand something. Otherwise, you are just wasting both of your times.