Thank you for getting back to me. Your description of what happened to the first bird sounds more like it had a tumor, rather than a hernia. Unfortunately, parakeets are extremely prone to tumors. Surgery doesn't help very much, and often, the bird dies shortly after. I think your friend's best decision would be to see an avian vet as soon as she can. If this actually is a hernia, an avian vet would be much more likely to be able to help. There isn't a nonsurgical treatment, but an experienced bird surgeon will probably get the best results. If the bird has a tunor rather than a hernia, an avian vet will be able to diagnose that, too. General vets are not often familiar with bird problems. This link will take you to a directory:
http://www.birdsnways.com/birds/vets.htm
If the birds are eating a mostly seed diet, they're much more likely to develop tumors, fatty liver disease, and other health problems. Pelleted foods are best, and should be supplemented with fresh produce, and a few seeds as treats. This site has great information on care and feeding:
http://www.4animalcare.org/birds.html
If you need any more information, or have other questions about this, just let me know by clicking on REPLY. There's no additional charge for such follow-up questions.
Anna