First: Forgiveness takes two people. One has to genuinely ask for forgiveness and admit they've done wrong. That's why Jesus wants you to ask him for forgiveness.
Second: Yes, you're being preachy about something you know nothing about and making a lot of assumptions.
If my wife's mom was in a bad mood, she would order her to close the windows. My wife (starting at age 5 or earlier) would start weeping as she closed the windows, knowing that if she didn't it would be worse. She'd then get a beating, for nothing. Her mom would call her worthless, ugly and fat constantly. The times of affection can be counted with the fingers on one hand. It was a lifetime of emotional and physical abuse that she only escaped by running away.
And yet, partly because of guilting from people like you, my wife tried her damnedest to forgive her mom and get her mom to love her. Every time it would end with my mom trying to use her, and putting my wife down. It took years of therapy to get to the point now when she can admit to herself that she's not a bad girl, that she didn't deserve the abuse. And that it's best, to put it mildly, for them to not speak again.