Thank you for your inquiry on behalf of your customer. Celestite is a healing crystal that supports the lungs and breathing, as does Seraphinite, a wonderful all around healer. Both of these crystals are also revered for connecting one with angelic guidance. Copper is a wonderful conductor of energy and would be a great addition to any crystal she chooses for healing, particularly in the form of jewelry as she can ensure they stay near her for long periods of time.
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I must share the standard disclaimer that I am not a doctor and cannot give out medical advice. Crystals for healing should be used as a complement to other therapies and not as a replacement for regular medical care. The information offered here is based on a combination of my own personal experiences and that of others on using crystals for healing. My hope is that you will let your own intuition guide your path in working with crystals as well.