The parents of the 15 year old blame the older girl for making their daughter gay. That's what the believe. They also tried numerous times to get the older girl expelled from school and waited until she was 18 to press charges.
This is a clear case of parents in denial about their daughter liking other girls so they blame the older girl. That's all this is. It's not about age. It's about parents afraid of their daughter liking other girls. For shame.