There's a large difference between being natuarly thing, ie: high metabolism/thin & tall perents. And starving urself to fit into childrens size clothing.
As for Amy Lee, sure she could be gawth. There is no set definition as to what is goth. These days (down here wise) there is so many different classes of which it can fit into, as well as cross overs to other groups, ie: punk, grunge, metal, syber punk, fetish crowd and so on.
-N