as a christian i don't believe she meant personal sin caused mental health issues. but if she did you are right that is wrong. however she could have meant the sins of adam and eve in the garden when they ate of the fruit. before that moment everything was perfect for them. that moment is when humanity was cursed because of their sin. that let in a whole lot of imperfections. so in a sense she is correct, but in a sense she is totaly and absolutely wrong! it depends on how she meant her statement.