Why is she tagging the CEO and the APP? While the situation is horrible, there are many steps she failed to take to protect herself. I went to Hinge's website and they have a list of safety tips, many of which she obviously ignored.
Don't Rush
Take your time and get to know the other person before agreeing to meet or chat off Hinge.
Meet in Public and Stay in Public
Tell Friends and Family About Your Plans
Be in Control of Your Transportation
What he did is awful, but she allowed herself to be the perfect victim. She should put more effort into explaining the precautions she should have taken that she failed to if she really want to keep women safe. Because this could happen with a guy you meet anywhere.