Problem
First name
Madeleine
School
Kensington Prep School
Country
Age
10
I worked it out by trial and error. I drew up a grid, and started drawing circles in different places over it, making sure I didn't make the four corners of a square with them. I did this several times, to make sure there weren't any other solutions. My answer ended up being 11:-
O O O
O O
O O O
O O O
If you find a different solution, I'd love to hear about it, and if you spot any mistakes, do post it!