Responses
I think she can be both, since when they switched worlds they switched back to level one. my hypothesis is that whatever they gain in each world separately they keep in that world separately. So if they are level 32 in world A and travel to world B where their level 50 they will return to level 50 once they go to world B and vice versa.
Just like Filo-chan is not a Filolial in the this (Glass's) world.
Hell, now it's kinda sad
I am kinda scared that Raphtalia is now a part of the other world like she is the new holder of the katana, right? And it is a part of that world so either Raphtalia has to stay there (bc she isn‘t a slave of Naofumi anymore like she is now the new holder of this vessel so she needs to stay?) or she can leave that world and return with or without the katana. But then the other world would lose one of the vessels....╥﹏╥