Wendy Marvell is a pretty tough member of Fairy Tail who has proven herself many times over. She can hit Vegeta with a lot of long range wind abilities to keep him at a distance and those attacks will certainly begin to take their toll as the match rages on. Still, she doesn’t have anything that will ultimately be able to knock him out so a victory is still out of fight. Once he goes Super Saiyan then it’s all over. Vegeta wins.