Tiki can turn into a dragon and launch a lot of fierce fire attacks, but that isn’t enough to deter an opponent as powerful as Vegeta. Vegeta won’t even take damage from such an attack. Once he goes Super Saiyan then he can simply fire off a ki blast that would cut right through the fire attacks. Tiki isn’t fast enough to dodge Vegeta either which really limits her options here. There’s nothing she can really do to win here I’m afraid. Vegeta wins.