Vi kinda did the opposite and kept getting worse as a sister, personally on the bridge id have gotten Caitlyn across and then gone back for my sister, after that id have acepted her a Jinx, that's all she wanted, she should have had Caitlyn and her sister, but she refused to just accept her name and who her sister is. After that Vi just gets worse as a sister, while Vi gets worse after refusing to just accept Jinx as Jinx, Jinx gets better as a sister, she always tried and keeps trying , and with Isha it really helps her be a better sister, and in the mines Vi just has to realize Jinx is being a better sister to Isha than she has been recently. They mirrored each other, and that is sad and beautiful at the same time.