Looks to me like they made a mistake when trying to fix her broken hurtbox. I believe something like this will be fixed sooner or later since it's very... weird to look at. Her wings have been moving since she debuted. It makes no sense for them to take that away now.
Team Ninja: "Th-th-there's a perfect explanation for that! After the positive reception of the character in DOAX3, we decided to retcon her as a tengu on a quest to become a real girl. Dragon Ball retcons things for stupid reasons all the time, why can't we?"