She has very high health, a crushing attack, fast attack speed, and decent range. However, she has a sluggish attack animation, making it difficult for her to advance. She also survives a lethal strike.
Strategy[]
Bring a lot of meatshields and fast-attacking Cats to defeat her. Alternatively, instead of fast attackers, bringing slow but strong attackers with meatshields can also work against her.
Turn the animation on and off using the switch in the upper left. Clicking the viewer background enables scrolling and zooming with the mouse if on desktop. Note that browser zoom may cause issues with scrolling and zooming. A list of available backgrounds can be found here. For more info on usage, see here.