Dear N.,
I understand your frustration. I worked in a home for abused and neglected children and have seen these behaviour symptoms many times. My suggestions to you are not going to be the norm, mine are very effective though.
When a child is taken from their home for their own safety and placed in a treatment home or evaluation home prior to getting involved with foster care, unfortunately they are immediately placed on medicatio: seroquel, concerta, welbutrin,fluoxetine and a host of others. In a very short period of time these children display anger, anti social behavior, depression, bipolar tendencies, ADHD, and delayed learning behaviors. These medications are absolutely not necessary, but the state funded homes are under notice to give meds or not get funded. Its pure promotion and propaganda for the pharmaceutical companies tied in to the state funding.
I am sure you have done everything correctly, but a new approach is needed. I also was a Montessori teacher and find Montessori Philosophies invaluable to the exceptional child. I would start with the childs diet and get her off meds if she isnt already. There is a 3 month period of withdrawwals, sometimes longer that the child will exhibit these same or worse symptom.
Learning EFT ( emotional freedom technique) with your child and finding a naturopathic EFT practitioner would be a start. Take her off all food colorings, preservatives, and processed foods. These all aggravate the symptoms and have terrible side effects. Get the book, " Food Additives- a shoppers guide to whats safe and whats not", you can find it on the web. Basically a vegetarian ( meat hormones, GMO fed animals, and steroid pumped animals are the culprits of many disorders, as are pesticides and chemicals in food) or organic wholefoods diet is best. Grains are also a source of agitation with children, and absolutely no peanuts or peanut butter (Heavily sprayed crop- also soy and corn are all sadly GMO foods now).
I am a certified Raw Foods chef and nutrition consultant and I can help outside of this if you like. I am not saying go Raw but know there is much help in altering nutrition and learning some techniques. An Art therapist may also be fun for her, and a source of great insight to you. Your little girl has seen many things that have affected her adversely, things from when she was 1-2 years are not unusual to remember. Especially if she has had trauma with a female in her life.
I can be contacted at L. at purelovelivingfoods.com if you like with a dietary approach.
It will all work out, much patience and love is needed. Reinforce love at all costs, you will have a wonderful turn of events.
L.