Zap2it has released a new synopsis for Sole Crusher! The synopsis was originally in Portuguese so here is a translation:
Marinette meets Zoé, a new student at her school. But she has no idea that Zoé is the half-sister of someone very powerful at school and that that person will do anything to make this friendship be crushed.
Taken from: https://miraculousladybugnews.com/2021/05/14/new-sole-crusher-synopsis-released/