In this case they are talking about Suu's experience, the rest is up to you as usual. The Mother's unrequited love was discussed 3-4 volumes ago (in the chapter where they discussed the importance of love experiences for dance), but that was a long time ago.since momoka knew about sumire's crush and about kurokami..
is it safe to say she predicted sumire will perform beautifully in this "heartbreak" dance and it implies her unrequited love?
also does that means azusa and momoko both have unrequited love as well since theyre both females?
Their relationship canonically mirrors that of Kiyo and Suu. The rest, again, is up to you. It was never that big of an issue. If you like, you can always read it as something deeper than "just" idealized geisha sisterhood.DON'T DO THIS TO ME, PLEASE.
Momoko and Azusa still proving they are only roommates.