Ignore the people suggesting a lot of people get her wherever, I think. They almost certainly don't have a large enough sample size to make that sorta statement.

There are a lot of rares to pull from in Kage (I believe it is nine). And that means that your rare drop (around 60 scrolls still) will give you a one outta nine chance for her. Much more likely than not that you don't get her. But still... about 11% of the people would get her as their very first rare pull.

Basically.... LUCK.