How does Kirika know she had to contact Mireille? (SPOILERS)

I finished the series again. And I think I found a plothole.

My question is this: How did Kirika know that she had to contact Mireille at the beginning of the series? From what I understand, she shouldn't have known her.

Things we know:

- When Kirika woke up, the only word she knew was Noir.
- Kirika finds the watch.
- The codename Noir was not adapted by anyone until AFTER Mirelle and Kirka teamed up together. (Episode 12, ~11:30 time run.)

The last part is the killer. From what I understand Mireille didn't have a codename or any reference to Noir. It was until after they met that they took on the name Noir. And from what Kirika had in her possession, she shouldn't have had enough information to know who Mirelle is.

The only explanation I can give is that she did research on the watch and realized it belonged to Mireille's family. I felt it would've been better if Mireille always had the codename Noir, that would be a clear connection.

Did they mention anything about this issue in the show?