Yeah. I think maybe Ragnarok and I are not understanding each other again. I'm good with Leather + 2 if they give her a Dex boost and trade Strength for it. I don't mind her with a boost in Dex but her stats still need to be balanced like any normal character.

So, I think these should be her stats:

Strength 10
Dex 16
Con 12
Int 10
Wis 16
Cha 14

Her level 4 upgrade took her Wis from 14 to 16.

Then she wears Drow Leather, AC 13 + Dex, so AC 16. With Shield + 1, she'd have AC 19.

Then turn her mace into a Rapier. Same everything else about it, but she uses a rapier instead of a mace because of finesse. Then, in combat, have her using stealth-based moves. If she uses Shield of Faith, AC boost to 21. If she uses Mirror Image, she's even harder to hit.

Perfect.