Possibly. Unless Sonya just packs up and leaves, jetting somewhere with Bianca. Despite Sonya & Peggy being friendly, they don't seem to have long phone calls nor do they seem to catch up. That leads me to believe that each of them have their own issues/life to deal with. Peggy and her work and being tired most of the time, coming up for air to shagging Gary. Sonya, well, being Sonya.
Peggy might just never want to think of Bianca again. And since Sonya showed herself the way out of Gary's apartment, she might not even be seen with Bianca.
Interestingly enough, I wonder if Bianca will cure Sonya of her "I'm not a lesbian" delusion, or if Sonya will ever get rid of that mislabel.