Sarah, your daughter has to WANT the therapy. She has to understand that it may take a while for meds, therapy, or anything to take effect. If she's constantly self analyzing herself and keeps wishing things to be different, she will remain stuck in this rut. Why is that? Let me explain.
Anxiety is worry. Worries serve a single purpose. To make us more aware of possible dangers. So what can you do when you spot the danger? You'd take measures to either fight it or run away from it. With anxiety, the danger itself are the thoughts and all those nasty physical symptoms. You try to find ways to deal with them, make them vanish, but that isn't possible because these symptoms are there to protect you! If a rabid dog chases you, you won't stay there and freak out why your heart beats so fast or why your breaths are erratic, yes? You'd simply run away and think later! Thing is, all that adrenaline subsides after you reach a safe place. A normal person wouldn't even notice that high state of fright that urges them to run. They'll simply go along with it.
So to go back to my original idea, you cannot fight thoughts with thoughts. Your daughter most definitely tries to fight fire with fire. She's stressed out because of these weird symptoms and in turn worries even more about how unnatural and bizarre the situation is, thus releasing even more adrenaline into her system.
I know it might be hard for you to do this, but you HAVE to explain to her that things get better and that she can live with it. There are cripples or other unfortunate folk that have it way worse than her. The trick here is to desensitize her from anxiety. To take the power away from anxiety. In order to do that, she has to shift her thoughts towards other activities, such as games or learning something new or watching the tv. She needs to prove to herself that she can do stuff regardless of her state of mind. Once her focus shifts from anxiety to something else, the symptoms will start to dissipate.
A lot of people on these boards said distraction is the best form of temporary therapy. Give her something to think about other than anxiety and see how that goes.
I wish you and your daughter all the best, Sarah. It's not easy, but you can get there. Like the posters above me said, she is very young. The brain is still malleable at that stage, so with proper management I'm sure she can be rid of anxiety in less than a year.