I don't think the most likely replacement for Evina "if" she goes pro is Carolyn or Aubrey, in fact far from it. Remember for much of the season we had a wing playing the 4. First it was Anna, then when she was injured Nika started and Evina became an undersized 4. When Nika got injured Aaliyah started and we had a more traditional big at the 4, and Evina moves back to the 3.
Aaliyah in my opinion was the long term answer at the 4, and it was only a matter of time until she took that position for good. She has the starting position now and is unlikely to ever lose it going forward. That probably means if Evina returns, that two of these four come off the bench, (Nika, Evina, Christyn, Azzi). That is a very hard decision, but that also gives you two great options off the bench on the wings, before even bringing up Carolyn and Aubrey and Anna, who would appear to be no better than the third option off the bench for the wings. Aubrey can still get playing time as the likely first best option off the bench at the 4, and come in for Liv with Aaliyah switching to the 5. Amari might fill that role behind Liv but at a minimum Aubrey would appear to have minutes behind Aaliyah.
Carolyn might get regular time, but her time probably would have to come from the four wings competing for the starting position, a pretty high hurdle to get over. But that is the scenario of course with Evina coming back, and everyone healthy.
I suspect the more likely situation is Evina does go pro. In that case, one from (Nika, Christyn, Azzi) comes off the bench, and becomes the first super-sub off the bench for the wing positions. Carolyn could easily be in the mix after that for second wing off the bench with Anna. I wouldn't be surprised if Carolyn is ahead of Anna and if she does very well threaten Nika's playing time a little. Aubrey might get some time on the wing, but I don't think it will be much, and more as a situational substitution where in that particular game situation Geno wants more rebounding or a defensive stopper on the wing. Normally I think he will want more ball handling and a three point threat there, which he will lots of options for.