Hey
This sounds mean but your Auntie should care more about your cousins health because obviously she is not don't this for attention well I would hope not there is a reason that she has done this and letting her have a tattoo will not stop her
SH if she doesn't want to it will just make her
SH in other places on her body making your Auntie believe that she no longer does it. How old is you cousin because she may regret getting a tattoo in later life because then it may bring back bad memories like for example why she did it.
If you need to talk
PM me
Chaazza