My eleven year old daughter loves Jacqueline Wilson books and her Magazine. I think it's called the Official Jacqueline Wilson Mag. Published by DC Thomson (who else?). Just started a subscription to it but you can buy it in newsagents.
We also get "Aquila" which DD likes just as much even though it's quite different.
I am visiting my 11 year old granddaughter in France in a few days and she has asked for some English girls magazines. I have no idea what 11 year old girls are reading, can anyone give me some ideas please.