What changed and why
A writer once explained that in his stories he got his characters up a tree, he threw stones at them, and then he got them down again. In other words, he gave his main character a problem, he made it worse and then he created a solution for them.
In my version of 'Thief caught in a mall', Kitty's problem is her relationship with her father. This relationship is made worse when he finds her outside the shop holding another mobile phone. But when she uses the phone to catch the thief, Kitty regains her dad's respect. But I'm sure you can think of other - and probably better - ways we could have developed Kitty's character, and put her actions into a context where they had a little more meaning.
I also made some other changes to Wesley's clever original story. I didn't include the wanted poster of Bobby, or the photo of the thief on the front of his mobile phone, so there was an even greater need for some smart detective work.