Eve teasing a 13 year old

My sister was walking back from her tuitions which is a 5 min walk from home, two men on a scooter follow her all along the way, then stop right in front of her smirk at her and then drive away. Keep In mind she is 13 a literal child. She comes home and says "did I do something wrong" And all she did was existed, will police complaints over such matters even be taken seriously?