First do you give your daughter a phone to use ? What is the model of the phone from your relative that one. Try to think of your daughter's personalilty and talk to her nicely when only two of you. I guess 13 years old is form 2 or form 3 right. Nowadays many secondary students have their own phone with them all the time. um.....you better observe and find a good time to talk to her. HOpe she won't do it again in the future!