I don't think this is toxic yuri, the white haired girl made a good point when she said that even if mc girl (sorry I cant remember names for the life of me) got her heart broken then, she would fall for someone else later and her grades would fall again, she just needs to learn how to deal with love and studies at the same time,.
And not just with love, later in life if she wants to become a millionaire she will have to deal with work while being distracted with something, she just needs to find a balance.
So unless this takes some crazy turn, I officially-unofficially label it as non-toxic yuri!