Wow, it sounds like you have been very much there for these kids. For one, you are right in taking her to counseling. Maybe this reveals my ignorance, but I am not sure what headspace is? On thing I often tell parents (and it sounds to me you are basically the parent here) is if what you are trying is not working then try the opposite. I know that sounds cliche, but it seriously works. If you have been to trying hard and strict with her, maybe let up a little.
One other thing I would recommend is what i often suggest, find a way To give her a weekly set time of uninterrupted, unconditional, positive regard. I am not sure how you make this happen, but it is very important. This is a time in which your focus is totally on her and completely positive. You try not To talk about her behavior. You Simply enjoy time with a child you love. I know this sounds kind of hocus pocus but it works. . Consistency In her life could be helpful as well. She needs to know what e h day and each hour holds. Finally if you could get her mom To attend some flu selling with her it could do wonders. No of fence, but I put the blame for this squarely on the shoulders of mom. If she could own up to her. Is takes and co e clean, she might literally save her child from a life of hell.
I hope that was Helpful. Let mE know if you have questions.
I noticed you still have not accepted my answer. i know my response may not have been what you wanted to hear, but it was an honest answer based on the information provided. If you have any further questions or information please feel free to post further dialog. I really do want to help you. Otherwise, would you do me a favor and leave positive feedback. This is the only way I am compensated for my time and service to you.Thank you!