I loaded the game up and equipped her with a rapier just a little bit ago. It says she isn't proficient with the rapier, but the bonus listed seems to say otherwise.
She was getting a total of +3 to hit.
+1 from Strength, and
+2 from Proficiency
I assume she's not getting the finesse feature because she's not proficient, perhaps? Otherwise, she'd be getting the +2 from Dex instead of the +1 from Str. And I don't believe she should be getting the +2 from proficiency. So I'm not exactly sure what the game is doing right now in regards to her weapon choices.
