This is spot on.
There is no hope of any reconciliation, forgiveness or trust between any of you, if op continues with this level of anger and resentment. Why would anyone want to continue having a relationship with a partner who hates their child? Or do you express yourself differently to him Op?
Teen girls can be extremely challenging but you don’t respond by upping the ante or ignoring a child in their own home.
I think we can all guess why a teen would lie and say she is being starved, that her clothes aren’t washed, and she’s not allowed to shower. It was an awful thing to do, but what do all of those things represent? Love. Love is what she is obviously lacking. It might be there in some forms but this teen is not feeling it!
Not from her mum who has moved away, from her dad who is too indulgent to do the hard work, and a stepmum who hates her. Of course the wrong response is to take the accusations literally.
No matter what has happened, op is the parent, and sdd is the child. Many fifteen year olds act impulsively and without thinking through the bigger picture. This teen needs solid, firm, calm kind boundaries not inflammatory hatred, even if it’s not expressed out loud, and being ignored in her own home. That is a highly disregulated response. Imagine coming home from school to that. The child was waving a massive red flag when she did what she did, and when your kids become teens op you might understand it better.
So many mothers of young children in blended families don’t have a clue what teens want or need. As a result the incumbent older adolescent gets constantly and unfavourably compared to the young dc who are still cute, happy, compliant in the main part and whose problems are easily fixed.
Instead of intense hatred, and taking this so personally, the way to resolve this is to try and understand the motivation behind her actions and see what can be done to resolve the issue and move forward.
As the poster above says, even if this teen is out of control and beyond help, it’s still no excuse to match your response to theirs. Your response needs needs to be objective and independent of any feelings you have about her actions, and one of taking the high road, no matter what, because you are an adult and you chose to be in this child’s life,
You all need family therapy. Urgently. And the households need to divide.