It's been a bit overshadowed by the Big Punch, but is that a different hairpiece on May? The old one was looking really spiky by the end, and this one is more soft. Plus I'm guessing that the old one was produced by auto-installing large numbers of hairs, while the new one is manually sewn onto the scalp. The old hair thus might not have been removable from the old myomer.
If it's new, then she's lucky the Robot Fight Club had a full hairpiece laying around in the correct blue color. Whichever, the new look is a lot softer. We'll have to see if this experience has softened up May's personality to match.