Can you answer me this;
How long have you been living with this friend?
You say the mother will not provide her address nor answer her phone yet you say she has harassed you and the friend through email. If you needed to contact your mother, why not use the email she has sent the emails from?
Oh Ya, you said you and friend wanted your mother to leave you alone.
I can't quite understand how you expect your mother to communicate with you or friend if you have taken the stand you do not want your mother to contact you?
What it sounds like is it is you that is avoiding your mothers attempts to speak with you. By chance does your mother want you to move in with her?