Kerrigan wasted much time on seeking revenge against Arcturus Mengsk. This gave Amon enough time to find a way to cross dimensions. Luckily for Kerrigan, It seemed like Amon was in a hurry and had no time to cover his tracks. Thanks to this, she found a way to follow him into whatever plane he traveled to.

She was ready for the worst. The world she was about to find would no doubt be wicked and dangerous. Without a doubt, even the fiery zerg homeworld of Char would look like a child's playground compared to the one she was about to see...

PS: Anyone else tired of waiting for Legacy of the void to appear?...Either way, you've got my answer

Edit: Obviously this was written before Legacy of the void came out.