inb4 yamato turns out to be the "ace" of the beast pirates she switches on the alliance and knocks out everyone relevant before they can reach her dad and tricks everyone even the readers...
While this would be cool, it makes no sense unfortunately (at least being a calamity who supports Kaido, she could very well be the "Ace" being Kaido's child).
- Yamato was handcuffed with an explosive device
- Yamato is known for being entirely rebellious
- Yamato hit Ulti pretty hard so she couldn't harm Luffy
In all instances, she's a good character. I won't deny there is some more underlying stuff with her, but I don't think she can be bad at this point. If it was a role she was playing, then she'd entirely be just another Kanjuro and that would be terrible.