You may need to educate yourself on what you can do to help your daughter eat a more balanced diet that does not congest that important part of the digestive system. You will find this informaiton in the Key to Health and Rejuvenation. There you will find what happens to kids and adults if they eat the commercial breakfast cereals, milk and milk products, junk foods, sleep late and go to bed late, etc. etc.
The main role of the apendix is to breed and supply the colon with probiotic bacteria needed to produce essential nutrients like B-vitamins and maintain healthy functions throughout the body. Antibiotics destroy the population of these bacteria and increase yeast growth. This can cause constipation. The constipation leads to backflushing of waste into the upper GI-tract, the stomach, throat, nose, ears, eays and brain.
Certainly children can cleanse the colon from age 3. I had children do liver cleanses at age 5, producing several hundred stones. A colonic or two would be necessary to remove any fecal matter suffocating the appendix. To help her restore the bacterial balance, she may use Primal Defense, which you can search for on the web. Make also sure to make the appropariate adjustments to her diet (see above book) so that she doesn't recreate the same problem over and over again. Protein foods such a meat, fish, eggs, cheese and milk shoudl be avoided at all costs, as they putrefy in her intestines and invite destructive bacteria. White bread, pastry and pasta, fried foods, crips, sweets, etc. are also on the avoid list. If there is an infection, use Pau d' Arco, 4 capsules three times per day.