It sounds like your daughter needs some help learning how to manage her anxiety and worries.
You didn't mention your daughter's age, but there are appropriate interventions for any age.
Here is a book for ages 6 and up:
It's called What to Do When You Worry Too Much: A Kid's Guide to XXXXX (What to Do Guides for Kids)
The book is based on the principles of Cognitive Behavioral Therapy (CBT). CBT examines the interplay between beliefs, emotions, behavior, andfeelings in one's body when in a particular situation. Intervention in one areawill affect the entire system. Understanding situations and learning how to relax are big components of CBT. Also, with CBT one does a lot of work with identifyingbeliefs and making counter or alternative beliefs to the irrational ones. Theseare then tested out in real life situations in the form of"experiments." It is a highly effective approach for lowering anxiety.
Kids often respond quickly to these types of interventions. They seem more accepting and willing to do them than many adults! Also, they do not have years of history that they are carrying around with them, which often makes this type of therapy efficient and very short term.
You could try the book and see how she responds. If it seems like you need more help after that, I'd recommend that you find a CBT therapist.
You could look for one at one of these websites:
www.adaa.org (The National Anxiety Association)
www.psychologytoday.com (Lists therapists by city with pictures and profiles).
I'll give you the instructions for abdominal breathing --it is a highly effective technique for lowering anxiety. Again, children tend to take to it quickly. Have her practice first by lying down and putting a book on her stomach. If the book moves up and down, she's doing it correctly. Here's the full instructions:
This is called the 4 by 4 breathing exercise because you shouldpractice it for 4 minutes 4times a day to learn to do it well. If you are able,do this with your eyes closed, imagining a pleasant place. This is calming anddesigned to help youmanage stress. There are two importantthings to learn about breathing:
1.Learn how to breathe from your diaphragm (from your tummy area) and make thatpattern a part of your daily life.
2.Become skilled at shifting to diaphragmatic breathing whenever you begin tofeelstressed.
1.Gently and slowly inhale a normal amount of air through your nose, filling onlyour lower lungs. Place your hands on your tummy so that you can feel it risingand falling with each breath. Count to 5 slowly as you do it.
2.Exhale slowly through your lips, counting to 5 as you do so.
3.Continue this slow, gentle breathing with a relaxed attitude, concentrating onfilling only your lower lungs.
4.As you breathe, slowly repeat the word "relax" or "calm" orsome other word which means the same to you.
If you have difficultyfollowing the above instructions:
1.Lie down on a rug or your bed, with your legs relaxed and straight, a book onyour tummy and your hands by your side.
2.Let yourself breath normal easy breaths. Notice what part of our upper body rises and fall with each breath. Rest a handon that spot. If that place is your chest, you are nottaking full advantage of your lungs. If the book is moving up and down, then, congratulations, you are doing it right!
Deep breathing is an extension of this normal process. With one hand on yourchest and one on your abdomen, take a slow, deepbreath, filling your lower lungs, then your upper lungs. When you exhale, letyour upper lungs go first (causing your upper hand to drop), then your lowerlungs (causing your lower hand to drop).
Reminder: Too many deep breaths, instead of naturalbreaths in a row, will produce a sense of lightheadedness. This is not harmful;just return to natural breathing.
Natural slow breathing and the deep slow breathingseveral times each day. Practice natural breathing for a period of at least 4minutes, 4 times a day. The object is to train yourself to breathe from yourdiaphragm most of the time.
Please follow up if this answer does not address what you were looking for --I'd be happy to work with you further.