WRITTEN BY RIYA DUBEY
Kefla is the Potara fusion between Caulifla and Kale. Their fusion is the same as that of Goku And Vegeta called Vegito using the Potara earrings.
Those two are Saiyan warriors from universe 6 and are the only two female Saiyans introduced in the entire franchise.
During the fight with Goku, Kefla turned into super Saiyan form. Kefla became one of the most powerful players in the tournament of power.
She managed to overpower universe 7's strongest fighter to the point where he had to use both Super Saiyan God and Super Saiyan blue.
However, even that wasn't enough as Kefla transformed into super Saiyan 2 form. This particular form resembles the super Saiyan Legend form that Broly donned. Although they might seem similar, it is not the same form.
Super Saiyan 2 Kefla would have defeated Super Saiyan Blue Goku easily. But Goku transformed into Ultra Instinct Sign at the last moment and turned the tide of the battle.
Kale, one of the warriors of the fusion, is capable of transforming into a Super Saiyan legend, however, that is not the case for Kefla.
Therefore, Kefla was not able to transform into a super Saiyan legend during the tournament of power.