I'll probably get shot down in flames for this but here goes.
Yes, I think that it was terrible that Grace was assaulted in the street.
Yes, I think it is terrible she is scarred for life.
BUT.
The scar she has is, in the big scheme of things, not that bad. The way she wears her hair anyway, from some of the photos I've seen, shows her fringe swept across her forehead covering it. She can cover it with makeup and there are lots of scar reduction therapies available to help make it less noticeable. Chances are, the scar will fade naturally over time anyway and be hardly visible.
The way she is carrying on is doing her no favbours when you think of the dignity of those people injured in 7/7 and other major incidents who suffered extreme burns to their faces. That's being scarred for life.