Being a step parent is a harder job than being a parent. I've got 3 step kids, none girls though, and they did in the past come very close to splitting up me & Mrs Monk. If I was you I'd would take Mrs Blue away for a weekend and try and have a sensible discussion about the girl's behaviour, ask Mrs Blue what she thinks can be done to resolve the issues. Explain to her that it hurts you to see Mrs Blue being treated so badly by her daughter, and that you need to come to some agreement on how you can both resolve the problem. It's then a contract between you both to try and get her to act like an adult. Don't forget, whilst you might feel it is Mrs Blue's responsibility to resolve the issue, she needs your strength to do so. You knew when you hooked up that there was a 3rd person in the relationship, so it's a joint venture getting the problem resolved.








Other than that, sling the bitch out on the street.