All of the above is true. And that is why teachers are not allowed to let anyone, including the parents, come into the classroom and take the child out. Only an office worker should be allowed to do that.
I think it is a pretty big coincidence and a lucky break for ' Tiffany' that there was a substitute teacher this morning. Think about it, how very 'lucky' that was.
I bet the regular teacher would have known Naiilla's mom was not named Tiffany and probably would have recognized her, hajib or not.
And if nothing else, the regular teacher would have said that the visitor needed to go back and wait in the office, and could not take the child with her right then. JMO