Why does Ariana say she'll be friends with Scheana regardless if Scheana keeps in touch with Tom?

I'm an Ariana fan, but this point definitely had me confused. She said multiple times in the season she doesn't want to have mutual friends, so I can understand why Scheana is nervous about actually having Sandoval in her life. When Ariana says she never said she'd stop being friends with her I was like...wait what?

Is it just a change of heart or did I miss something?