Lucy's a High school Student?

So what happens when Lucy ends up in a parallel universe where she now must find her way back to her world of magic. She attends Fairy tail high in the hopes of finding some sort of way back, read as Lucy finds familiar faces.

I'll clarify this now the two Lucy's did not switch places, one Lucy had vanished (ill bring that Lucy back later) so the other Lucy was pulled into another world to fill the void left by that Lucy. confusing yet