I've heard differing interpretations of the role of Harry's mother's magic.
The one I currently believe, is that, Voldemort did in fact evade his mother's magic, but that protective magic was reinstated as soon as Voldemort's soul fragment was removed from Harry's soul. This is justified by the fact that when Harry grabbed Voldemort and tried to fall to their death, they screamed in pain as they flew around, because the contact hurt Voldemort once more.
But there's another-that was that that magic was exactly what protected him when Voldemort hit Harry with the killing curse. This is specifically in conflict with the idea that since Harry was the true owner of the Elder wand, the Elder wand would allow him to win any duel.
The problem with the Elder wand idea is that, there were other cases owners of the elder wand were killed by competitors, as when Dumbledore defeated Grindelwald. If it has more to do with the fact that his mother's magic protects him, then how do we interpret the purpose of the Elder wand? If it's the Elder wand, then why didn't the Elder wand kill Voldemort in that attempt straight away, rather than before he tried to invade the castle again?
Also, the idea of Elder wand ownership is kind of funny when it comes to Harry since he is occupied by two souls, his own and Voldemort's fragment. To which soul does the Elder wand attribute loyalty, and how does it determine this, if it is in fact the Elder wand's doing that stops the killing curse from rupturing Harry's own soul as well?