Kyoko collapses at 39:30 in the
video
That’s why we don’t see her for the rest of the fight.
It technically could be possible that they defeated Walpurgisnight in this timeline, as we don’t see Walpy run off like we do in the others. Maybe Madoka gave a suicide attack similar to the one we saw at the end of the MagiReco anime.
However, even if she did defeat Walpurgisnight here, you could just argue that this is anweaker Walpurgisnight. Tamura Magica revealed to us that Walpurgisnight varies in power from timeline to timeline. Which makes sense if you think of Walpurgnisght as a conglomeration of many Witches. The strength of the individual Witches that combine to make it would likely be a determining factor in how strong it is.