I think you nailed everything.
Nika-- a pg (1) only. I have no idea what to expect from her. None. Don't know if she'll be in regular rotation or maybe be terrific. And I don't know if she can play fast or mostly just play in halfcourt. Obviously it would be super if she can be a legit pg able to play in nay style and do it well.
Paige-- a pg (1) a sg (2) and a sf (3). It's hard to separate the 2 and 3 spots. In addition some teams small forwards play like sg's. And some bigger teams purposely play their sf outside because their 4's and 5's are more suited to being inside or 15 feet and in.
Evina-- a pg (1), a sg (2), a sf (3), a pf (4). I really don't know about her at the 4 but I wish I could watch the the below game. And I'm not sure if she a natural pg. In regards to her playing pf-- not every team plays big. Secondly, not every team that plays big can defend well. I'm not suggesting her as a full-time pf but maybe situational in which most teams don't have good bigs. Maybe a situational 4 as well as a situational 1. But again maybe she can't play it all. I can't find much videos on her in good games and the link below maybe she was just lucky grabbing 8 rebounds in a tight game of which 5 were OREB.
I definitely though see her as you do as a wing. But how knows? Maybe in wcbb and maybe for this team she can play up to the 4 at times or maybe more? Unless Anna at times can be a 4? Right now I see Aubrey at the 4. But what makes soph Aubrey a 4 vs sr aged Evina? Probably the 1 in ch in height? Probably. Obviously not ideal.
The official box score of Women's Basketball vs Missouri on 2/17/2019
utsports.com
Edwards-- I see her just as you. A 4/5. I don't see her as a sf at all. She is another wish I had more tape.
Mir-- I agree with you. Not sure offensively where she fits in. Is she better guarding quick laterally or better guarding the post as long as they aren't too big? IS she a good passer meaning maybe she shoots better than Aubrey so you could put her the high in a high low? And just because you have her on the high as a high low it may not means you have to run the offense through the high. If for example Evina and Paige are in together they could hit Mir for mid range shots. Or even if you have her on the perimeter-- and she isn't much of a threat you could still have Paige, Evina and either Anna or CWill with Olivia and you still would be able to run a good offense.