Need an Explanation

[Stephanie]

First off, I want to say that I absolutely loved this book. It was extremely witty and the well-placed clues for the twist at the end was fantastic. However, I just have a quick question.

!!!!SPOILERS!!!!

At the very end of the book, the last line states "'Flannery -' he said, and the bell rang just as I found it. For what I was looking: the seven of clubs."

I am confused to what Handler means by this. Does he mean that there were actually only seven people in the "basic eight" group since the audience now knows that Natasha does not exist?

Furthermore, who do you think took the group photo?

If you guys could help me out, that would be amazing.

[Amy]

Besides any symbolic meanings, if you read the first sentence of the introduction, you'll see that Flan is playing solitaire.

My guess is that Flora took the photo.