Thank you for your inquiry. I would like to suggest a couple of crystals for your daughter. I would recommend Lithium Quartz and Kunzite. If she could wear these crystals in pendant form and drink water charged with them, their vibrations could assist with the anxiety energy. For the energy that may be causing the anxiety in the abdominal* region, Amber has worked wonders for the members of my family. Since you daughter is suffering from anxiety, perhaps her teacher, the school nurse, and the school counselor, may be able to find other ways to deal with this stress and find ways to alleviate it.
Your Fluoriteand Amethystbracelets may be good for her at night to aid in getting a more peaceful sleep. I would place them under her pillow. Alternating them at first is a good idea. If they aren't helping as much as you would like, try both together.
I hope that this information can be of assistance and that crystals grace your journey with love and light.
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*Disclaimer – Crystals are not a medical treatment and should not be used as a replacement for medical care. Please consult your healthcare specialist for your particular needs.