With sexual abuse of children, we know that "forgiveness" often means "I don't think it is really so bad, we should just get on with our lives, so I will pretend to acknowledge that it is bad and then ask for forgiveness".
In fact, I am very wary of the idea of forgiving crimes that were not committed directly against your own person.
The pope forgiving the man who tried to kill him (and is in prison already) - yeah, okay.
A woman forgiving a man who raped a child - doesn't matter if the child is her own - is extremely dodgy.
When the Christian idea of forgiving your enemies evolved, it was common to revenge a crime by wiping out the criminals whole family, or in some cases, tribe.
Facing the social judgement that came with NOT avenging your family was the hard way.
Forgiving a sex offender nowadays is very, very often the easy way. I would not be so sure that her motivation is religious.
Forgiving her husband was the option that didn't require her to change anything ... well, except now, it is.