+1 to bailmint. You can't put just two females together, it's like putting two males together. They will just fight and try to harm one another. You need a minimum of four females to start a sorority and the more the better. Mine were still too aggressive when there were four and even five of them. The sixth is acclimating in a breeder box right now, and I plan on my final number being 8.
You can keep one girl in the breeder box for a few days until you can either get a divider or get one made. I personally don't know how to make them, but I know a lot of forum, members here make their own and can probably help you.
Best of luck! Hope the girls are okay. Stress coat will help heal damaged fins. Works like a charm in my sorority!