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This sentence is unusual. If it is the same as
Впору застрелиться!
or
Хоть стреляйся!
than it means "I might as well shoot myself" (because there are too much trouble or pain)

I'd say "As she is virtuous, she don't forgive sinners", although I wish I knew how to adequately convey the meaning of the construction "на то ... чтобы" :dunno: