Hello,
Welcome to Just Answer and thanks for your question. Asperger syndrome teens are usually fairly high functioning and can usually understand. Of course, every child is different, and some are more spiritually involved than others, whether they have Asperger or not. Asperger teens tend to have restricted interests and if spirituality is outside of their area of interest, they simply may not "tune in" to it. That doesn't mean they aren't capable of understtanding, it just means it is irrelvant to their interests at the time.
You can discuss it calmly and lovingly with her, but don't nag. You want to be a witness for your beliefs, not a pain to her. You can also pray for her. God looks after all His children, after all.
Nurse Practitioner
Board Certified Nurse Practitioner, MS, RN. Private practice and hospitalist experience.