What points to her being Murphy? That because she died a heroic warrior and was sent to Valhalla
she will remain Murphy? Maybe that part of her, but she was a more complicated person than that.
Also as many like to say, Jim likes to make Harry and the reader suffer.. What better way to make both Harry and her fans suffer big time, but for her body to come back, but her mind totally changed..
how both Jim and Gard talk about it. This is not some sort of zombie or black court vampire construction. It is her soul in it.
There is even a woj about waking up in a different afterlife than you expect. About deals between gods about specific persons.
The whole story does not make sense if it is not Murphy. We also know Vadderung uses soulfire for this. The fires of creation as some monster called it.
I think we have some sort of Christian exceptionalism here like there is only one real afterlife and the rest is fake. From what we read in skin game Hades is real and there is no reason to assume Walhalla is not. Just like Socrates is in Hades Murphy is in walhalla.