She is sadly not good at all because of the way you have to run her with squishy minions that have zero immunities and drop dead to something as simple as a lava entrance. Even if you only use two slots to place her, she still does not offer more value than two full mythics.
The main problem is that she only has Assassinate and Slayerbane, which are both extremely weak and do not make up for all her other limitations.