How does boss AI actually work in detail?

So im trying malenia again, and from what im seeing on youtube fights compared to my fights is that she is doing WAY longer combos (up to 10 seconds) than to other people. I remember reading somewhere years ago that Margit has a thing where when youre at a certain distance, that will trigger extending his combos.

So my question is, does the community know after all these years in some detail how the AI actually works? So i can adjust my gameplay to have it more like a back and forth instead of a back, back, back, back, back and maybe forth but actually back??