Depa Billiba- when did she turn to the darkside?

i discovered in the starwars episode 3 novelisation that depa billiba turned to the dark side, i was unaware of this. when did this happen? where? why?

Read the novel "Star Wars: ShatterPoint" this is where it all happens.

And, it happened because she couldn't accept eternal war and slaughter. She was weak, and the "Dark Jedi" there took advantage of her weakness.

I wonder if is still around or was killed off when Order 66 took place.

She went to the Dark Side on Mace's home planet.