Why didn’t Anya make someone wish that Willow never turned evil in Season 6?

If I recall, she had gotten her demon powers again in season 6 and I always wondered why she didn’t make anyone wish that Willow never turned evil, or wish that Warren never killed Tara and etc. I always thought that was going to happen for Anya’s character, and it would’ve been sick if Dark Willow “seeped” through this new timeline like a “nice try, Anya.” evil menacing voice. Just a thought though.