Awkward Query Question

I wasn't sure where else to put this since it's not about actually writing the query. Feel free to move if it fits better somewhere else.

I did a reading two years ago where an agent from a well-known agency offered representation after hearing me read my work. I let her know I didn't have a finished novel yet but I'd keep her updated on the work (no, it didn't take me 2 years to write one novel, I was writing one and trashed it 3/4 of the way through the first edit and wrote a whole new and entirely different one). I let her know that ultimately, my work is YA and would be better suited to another agent in her office as this particular agent doesn't rep YA. She agreed.

So now I'm about to query and I'm not sure who to send the query to. Do I send it to the YA agent and CC the one that originally offered representation or do I send it directly to that woman and CC the YA agent? Obviously I'm going to re-mention the meeting and such but ultimately, who should it go to?

Any help would, well, help. Thanks!