I would like some advise, really any advise will do!

I am a single mother of 2 wonderful girls. Brianna is 13 and is ADHD and Aeowyn is 7 months. Brianna is having so much trouble in school and has this 'I don't care" attitude. She is a very bright and loving girl, but this year she is in 7th grade and she refuses to do anything. This is the 1st year that she actually participates in class, but she will not do homework or write down her agenda (which she is graded on). She stays grounded and everything gets taken away, but she does not care. Today one of her teachers called and told me that Brianna has not turned in any assignments this semester and she does not care and I need to do something. Well, I am trying but I can not make her care. I feel so alone in this and like I am fighting a losing battle. The advise I get from friends and family is bust her butt then she will care. ha like that works. I do not mean to give a pitty kick, but I honestly do not know what to do! She goes to her PCP every month, her psych dr, and a counsler. I even go to the counsler with her, but nothing is helping. I see myself leaving her out more now, because EVERYTHING is a constant fight! Sorry for the woe is me, if anyone has some advise no matter how straight to the point it is, it will be greatly appreciated!

Mother in distress!

Patrice