Because she said that Leafpool deserved to die and tried forcing her to eat Death berries. But still she's not entirely evil. She just went mad because she couldn't stand being half-Clan.
It depends on what you think evil is. Hollyleaf does kill Ashfur though.
yep
yep
yes NO. SHE WILL NOT. EVER.
yes
Hey who knows? ANSWER 2: Hollyleaf
yes Come on she just went......mad.
yes
In the Warriors series, Hollyleaf does become a leader, but she does not turn evil. Instead, she strives to be a just and fair leader for her Clan, showing courage and loyalty throughout her leadership.
yes NO. She was driven mad by the fact that she was half-Clan.
Well she isn't really evil but some people think that she is because she murdered Ashfur and tried to kill Leafpool.
She wasn't really evil, she was just angry at Leafpool for breaking the Warrior code and that she and Squirrelflight never told her the truth.