Why is my child such a *%S!& liar?

At 9, she doesn’t seem to stop. She has ADHD, takes medication, but still the embellishments go on and on everyday. Today I found written on furniture, instead of straightening up her room, she hid the things in bags and boxes, she steals things from other family members, constantly breaks the rules…I’m fed up and almost told her I hated her today. She has had so many things taken away – no computer, no tv, no art projects, no play dates, no talking on the phone…nothing works because she can find lint and be entertained by it – that’s the ADHD. Any suggestions? The last two therapists I took her to, said that because of her high IQ I should see a therapist to learn to cope with how to deal with her.