For some reason the parable of the prodigal son comes to mind in this situation.
It's been my experience to never write off anyone from God's love and forgiveness.
If He forgives me He can and will forgive Katy if she is wanting to hear, repent, and follow Him. Her story would be a compelling one if this were to happen.
Instead of judging her, perhaps our attitude should be along these lines: Luke 18:9-14
“Two men went up into the temple to pray, one a Pharisee and the other a tax collector. 11“The Pharisee stood and was praying this to himself: ‘God, I thank You that I am not like other people: swindlers, unjust, adulterers, or even like this tax collector. 12‘I fast twice a week; I pay tithes of all that I get.’ 13“But the tax collector, standing some distance away, was even unwilling to lift up his eyes to heaven, but was beating his breast, saying, ‘God, be merciful to me, the sinner!’ 14“I tell you, this man went to his house justified rather than the other; for everyone who exalts himself will be humbled, but he who humbles himself will be exalted.”