I don't know, but I think I've head that before...Nah. I think I read this thread twice..
Anyways, I'll give you some constructive critsizim now...may not be the nicest critiszim, but I'll try being nice...
First, how would someone forget their friends from Grade 2? Did they stay friends until Grade 3 or 4? Because if they did, they really shouldn't of forgotten them. Even if they seperated for one year, someone doesn't forget a loved one over a year. Second, why is it so coincedental all girls go to the same school? Grade 6-8 is considered 'middle school', so they really couldn't of been seperated for about two years from Grade 2 to Grade 5. Even if one or two of the girls moved, why did they move back? When you move, you don't really move back. All the planets must've lined up when Girl A moved back and went to the SAME school the others are going to, but apparently their suffering from anmesia.
Third, their all going to diffeent schools. This is what email or phone numbers is for.
In conclusion, it sounds like a good story, but you have WAY too many plotholes. A few plotholes are alright, but this many? Sorry. I'm really sorry if me reveiw of your outlined story is harsh, but I'm not the nicest critic out there.