Her relationsip with kaido is the worst plotline in the series. I don't like sanji but his relationship with his family was a million times better.
Oda doesn't even know what to do with kaido and yamato, does kaido wants her to be the shogun of new onigashima? Or does he wants to kill her? Does he wants to add her to his army? Or maybe was he grooming her to be his next worthy opponent?
It's fine if she doesn't use swords, we already have izo who's not suited for swordsmanship, but completely adopting kaido's style is just cheap, jack was with kaido since he was 8 too, and he has his unique fighting style, most one piece characters developed their own fighting style at a very young age.
The way she got her devil fruit is so random, if kaido valued the fruit he should've locked it in a very secure room, but noooo, yamato got one, ulti stole two, kaido couldn't get any more incompetent.
Also what was her personality before she knew oden? Did she have different dreams? Why didn't she protested when oden was executed? It seemed like a mature action from an immature brat.
Her current dream is to get free and sail the sea and become strong, a very underwhelming dream for someone with a very strong CoC.
I'm just gonna ignore her.