> If the parts were not available or too damaged, the live body would regrow the missing members, but it took longer. The conjuration version of this spell took less than half an hour to regenerate missing parts, the necromantic version could take up to an an hour longer than that. Bones and missing or damaged organs would also grow back.
In theory if she simply wore a Ring of Regeneration for a month, her wings would grow back.
It always seemed a logical flaw. And plus with the main character being a god potentially, he could do it too.