I'm not sure. I skipped all that Jason Aaron stuff but I did Google it and it looks like it was retconned. Thor was attacked as an infant and died so...
I think the story was that she was not really Thor's mom--but helped to save his life so he could be born---or some such like that. More Jason Aaron...
Wouldn't this also mean that Jean is technically Thor's mom then? Another reason to have her one day join the Avengers to witness that dynamic. Just...