Ok here's my seed right now, still need to get her F skill so that would add 25 base attack.
Shes using Zhus engine, Riot Suppressor. 713 base atk, 48% CD and in battle will add an additional 15% CR bringing her 76% CR in battles as a baseline.
The fact that the engine gives so much attack is part of the reason I went with Pen Ration for Disc 5. I also read that if you plan to use her with Astra it's better to go either Pen or Electric for 5 anyway as you'll be getting so much attack boost and will start to suffer diminishing returns.
Although I guess with trigger and no Astra Electric or Attack is slightly better so it depends which teams your using. But because I got good sub stats on the Pen disc I'm just gonna let it roll.
Pen Ratio is also my poor man's way of getting the defense ignore her signature has
Edit.
I assume over the coming weeks she will naturally improve as i plan to farm that particular routine cleanup for the Moonlight set for both Yuzu and Nicole among others, so I'll naturally end up with more Dawn discs over time.