As a mother who has gone through this same dilema with my now 21 year old, I can sympathize. Speaking from experience and what friends & family members kept telling me, "They do it just to get a reaction and attention" My son was into the "Goth" phase when he was 13 and talk about depressing
He would wear black clothes all the time; painted his finger nails black & even dyed his already black hair darker even though I didn't think that was possible. His room was filled with Marilyn Manson posters.
We would have some real doozy of arguments over his appearance. There were times when I even dreaded going out with him in public.
I finally got to the point where I kept my comments to myself and within a year, he changed gradually. Gone are the black clothes, finger nails & Marilyn Manson posters. He does have a lip ring which he occasionally removes.
So hang in there, believe it or not she'll come around.
Signed
NO LONGER A GOTH KID'S MOM