"…wouldn'thaveeverseenthishappen?
"…wouldn't have ever seen this hapning in a million years," Mia babbled. My worrying was cancelling her out, for the most part.
「......一万年也没见过这种情况发生」，Mia在唠唠叨叨。我担忧的是不能把她也算上一个，最少是大部分（时间）。 Cancel someone out 的意思是把某人从名单上剔除，如：We had to cancel them out. We canceled out all the people who did not show up.