Carrying a grudge for a thousand years can't be good for your mental health.
Give it a rest, OK?
Sheesh, it's not even the person who did what you're pissed about.
Just as you are a descendent, so is she.
...Ever heard of Free Will, bubbo?
Taking someone as your Guardian Knight when you don't even know his name?
What is this, Loner Life?!
More seriously...
Why Makoto?
Look, he's the only person she can interact with in a completely natural manner, because he's immune to her powers.
That's a plus for her mental health, and a security risk needing closing; both in one oath is a bargain, right? Right?!
Sometimes the overwhelming numbers really are "all that".