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Just because she came back from the future doesn't mean she knows how people will act when the timeline she knew changes because she did something different. What I'm saying is the future she knew will not match this timeline. And besides, memory is often pretty unreliable. Plus, even if she did know exactly what events would transpire, how much do you think she could do as one single person, especially when she doesn't even know what was behind the scenes that caused it all? Who do you trust? How many enemies can you take? How will you save multiple people at the same time with limited resources? Etc
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But she knows the captain of the Blacks and Prince Edwards, are the two main focuses of the events. This should have been relayed to Princess and the captain of the reds. At least these two would have been strategic and could find out more by using their resources. She literally could've been more proactive.
This bitch is useless, she literally knows the future and didn't stop anything...