How do you know he's in Hell? Suicide is a sin, but Jesus's blood covers all sin. If he was a Christian, which he may or may not have been, he is in Heaven.
Get off easy...true repentance isn't easy. True, we suffer much less than our sins merit, but it entails first realizing just how evil our sins are, not only in regards to others but in what Jesus had to suffer for them to be forgiven. Even when people are saved, their memories are not wiped. Even knowing God forgives them won't erase the memory of what they have done. So if she doesn't place her faith in Christ, she will spend eternity in Hell. If she does place her faith in Christ, she wil be forgiven and spend eternity in Heaven, but live out the rest of her earthly life with the memory of what she did to this man and his family, and know that Jesus had to bear the weight of that on the cross.