I have been very fortunate that none of my dogs have allergies. My oldest girl is 12 years old and she is starting to show some stiffness in her joints. I give her glucosamine daily. I contribute the good health of mine to the fact that they are not over vaccinated. Many of the allergies that dogs are getting can be attributed to annual vaccinations. If you give vaccinations annually and they already have the immunity build up in their system then the vaccination will compromise their immune system. I don't know if you are giving annual vaccination but if you are then you might need to reconsider giving those if she is suffering so much from allergies.
As for holistic remedies, there are several websites they sell holistic remedies. Here are a couple of them.
Holistic Veterinarian Pet Nutritionist Holistic Pet Care Dr. Shawn's Natural and Holistic Pet Care News and Information.
I have not tried any of the holistic remedies but I am thinking of trying something for joints for my 12 year old. I wish you the best with you baby. Please keep us posted on how she is doing.