if she’s going to act like a toddler throwing fits, then start speaking to her like a toddler. It works especially well if you know anything about child psychology and can throw some buzzwords her way. Things like, “my friend, we need to learn to respect other people’s things. Do we need to take a walk or have a snack before we come back to play?” Gets them infuriated, helps them reassess, and is usually diffuses the situation. Sincerely, an adult woman with teen sisters