All in saying is that YES we have Gwen back. She is the Gwen character. But she's a different person. Look at the Peter clone at the Triskelion; he is Peter Parker, but not the one who died. This is the exact same thing. Think about it this way: imagine you died and were cloned. Your life is still over. You are no one experiencing ANYTHING but another person who looks like you and goes by yiur name IS. Whether or not you believe in a soul is beside the point. You must still believe in death. It's kind of been proven
This new Gwen might have the other one's memories, but she didn't actually experience them. Just like the first Gwen is no longer experiencing anything this Gwen is.
On a more philosophical note, say you do believe in souls and the afterlife. Peter and Gwen are probably hangin' out right now.