It is how you feel, do you feel the need to? Have you forgiven her? Can you continue looking at her as a sister rather than a molester?
If you are unable to forgive her, don't kill yourself, what she did was morally reprehensible. Would I restart the relationship? No, what she did was wrong and she wouldn't deserve it, but everyone is different.
How do you feel about her and what do you feel you should do?