I am so sorry to hear that your daughter is suffering and no doubt you are too.
If you have not done so already, I would recommend your GP as a first port of call. They can sometimes offer extra support, such as counselling services or Cognitive behavioural therapy (which can help address unwanted thoughts).
Although she is young NLP or Life coaching are other techniques that may be worth considering as they can help individuals tap into their own inner resources and find new ways to overcome challenging situations.
Both are useful in empowering the individual which in turn can boost self confidence.
The following link may help you find a suitable practitioner if this method appeals to your daughter and some specialise in working with younger people. You could also ask friends and family for recommendations. http://nlplifecoachdirectory.co.uk
Your daughter may also benefit from taking Passiflora complex, traditionally used for easing stress and nervous tension. It takes up to a week to feel the effects and if she has not noticed an improvement after a month, then we suggest exploring an alternative.
Confidence Essence may also be worth considering. This is a blend of flower essences which can balance emotions where issues of self confidence have been a problem.
I do hope things improve soon for you and your daughter. Please do not hesitate to contact us again, if you have any further questions.