I can understand how each of the sisters feel. The older sister feel like she's beneath her little sister because of her low grades and social life. The little sister is just tired of the toxic one-upping/jealous behavior within the family and just want to run away from it all. The mother was most definitely raised in that sort of environment thus she passed it onto her daughters. A cycle of abuse/toxicity, you can unfortunately see it in a lot of different families in the real world. Those two really need to sit down and just talk and admit their jealousy and yeah. I can see two ending to this, the cycle of abuse/toxicity continues to the next generation or they finally sit down and just talk. Therapy is definitely needed to fix the over jealous behavior even after the acknowledge each other's perspectives.