Dear Sue,
Your daughter's panic attacks can be caused by FEAR. She needs to reflect and talk to someone on what the problem might be. On a practical level she can do several things to help immediately
1. Cut out all stimulants- tea, coffee, and alcohol.
2. Take a good multi B vitamens and multi mineral supplements, plus lots of fresh food and vegetables. If possible fresh vegetable juice.
3 Yoga and especially pranayama. Pranayama will calm her. To start with she should learn to do ujjayi breathing (known as throat breathing- Make the back of the neck long, slightly tilt the chin towards the collar bone, contract the glottis and breath through the nostrils. She will make a sound as if she is snoring, only she must be able to hear the sound. She must then try to make the exhale longer than the inhale, perhaps up to, exhale twice as long as inhale. For example if her inhale is 4 seconds her exhale would be 8 seconds. When she first starts her exhale may only be 1 second longer, but with practice it will increase.
I hope this will help your daughter, but a good yoga teacher who knows about pranayama will certainly help with the panic attacks.
Best wishes
Yours in yoga
Cecily