Lots of good advice here; I agree with nearly all of it. I have Ameonna at 3^60, and I haven’t regretted it. Her best use is in a purple stack against yellow titans. My average titan damage is in the 25K neighborhood. Last week, I used Ameonna 3^60 in a purple stack with Tiburtus+7 and Sabina+7, and I set a new personal record at just north of 52K. So yeah, she’s good. Can be tricky to time her special so that there are immediate purple matches on the board in the turns after she fires.
It’s also nice that she can ghost in an alliance war and give you four free shots at the enemy without worrying about losing. That’s an ability I recently screwed up royally, but the fact is, it exists and shouldn’t be ignored.
There are a lot of great four-star purples, so prioritizing her can be hard, but don’t believe those that say she is garbage. She’s squishy, but her tile damage is boss. Definitely worth leveling sooner or later.