Kate thank you very much for your answer, I understood and I fell much more prepared to talk to my daughter.
One more thing, during our phone conversation girl's mother mentioned that girl herself did not want mother to call me, but her mom did it anyway. She thinks it was important for me and my daughter to know before. I am not sure how address that in conversation with my daughter. Should my daughter tell her friend we found out what happened already from her mom. My feel - is better no to tell. Am I wrong?