A friend was moving & she used my address..?

Just do as she ask put on the envlope moved an return to sender that should stop them from bugging you because she dont live there. You can tell them she asked for you to hold any incoming mail for her for 30 days and that she would be by to pick it up and that is just what she did. And If she was a true friend you would no her address and if she is not telling you then there might be a bigger issue as to why they are looking for her. I myself try to stay out of other peoples business it is better that way. but she might be laughing now but if they are looking for her hard enough they will find her and he who laughs first laughs last.. Good luck