You might wanna talk to your husband. Make sure he understands he is responsible for putting his foot down and supporting your role. My SD is the same way. She has a behavioral chart that keeps her accountable. I stopped taling it personally she wants to freak out then stay calm, and walk away tell her she can stay in her room until she decides to tell you the truth and stop having a meltdown. But one thing that might take time is learning her behaviors when she lies. Does she fidgit? Look anywhere but you? Learning these behaviors will help you be able to call her out on misconduct. But remember she is the responsibility of her parents, taking on full parental responsibility can cause you to have more stress and possible health issues if she's regularly acts negativly. I know I'm living it. Good luck and I'm here if you need to talk pm me!

You state that the bio mother is out of the picture and you have her full time. She is acting out, more than likely, because of this.

You can try sending her to therapy, so she can talk out her feelings. Her lies and stealing and disrespect will only get worse if her behavior goes unchecked.

You must be on the same page as your DH, he must ALWAYS support you, and be consistent.

I had SD now 20, who did this. I came into her life when she was 15, and her lies started small, and now she accuses people of things they never did. She was caught stealing at 17, and that came with a fine of $250, that my DH paid for her. Just recently she stole checks from her mother (and who else?) and cashed them against multiple bank accounts, including a child account in my husbands name.

No one ever gave her consequences. Shes living with her mother, Toxic Troll and not working, no college, and no drivers license.

So - hopefully its not too late for your SD!