Lorelei is is a member of the Elite Four.
The Elite FourEdit
Agatha, Lance, Bruno, and Lorelei are present in the Indigo Plateau, where Rusty arrived without any appointment. As Peanut Butter shows a sack of badges, Lorelei reminded them that they needed eight of them.
After Agatha's death, Lorelei and the other two Elite Four trainers decide not to battle him out of fear, and she invites Rusty to discuss educational district rezoning, but he thinks he will battle that.
After Rusty and Peanut Butter left, Lance asks if some of them should tell Agatha's family about her death, which Lorelei disagrees, and this was pushed to Bruno instead.
Lorelei was most likely to be present as a member of the Anti-Bidoof Resistance, and she was unfortunately killed by Peanut Butter.
In the altered timeline, Lorelei was most likely to repeat her encounter with Rusty and joins the Resistance and dies again. After Peanut Butter restored his faith in humanity, Lorelei was most likely to be revived by his undoing.