They have found that sinus infections can cause widespread pain. I'd also recommend having her screened for celiac disease. Both my sons complained of joint pain from about that age. Dr. said it was growing pains. We didn't learn until they were 8 and 10 that it was celiac. Pain is due to lack of absorption of essential fats and minerals important for bone and joint health. Also, the constant infections are a sign of poor immune function. The infections can trigger celiac and once celiac is triggered the immune system is compromised.
Also, if the daily meds your daughter is on are steroidal, then that could be the root of her problems. Steroids suppress the immune system thus she will be prone to get just about every infection to which she is exposed. I have bad allergies and found that out while on prednisone and nasal steroids. The better approach for the allergies are herbs and homeopathic treatments and preventative measures like no carpet in her bedroom, no curtains, no stuffed animals in her room, HEPA filter, no windows open at nite in her room and doing an elimination diet for food allergies. Most anyone with airborne allergies has food allergies.
I would also honestly consider whether you have ever been exposed to Lyme disease - i.e., have you spent lots of time outdoors - in particular in the East or West coasts or mountainous areas. Your daughters symptoms sound like mine when I was about 10 and got Lyme disease when living in Newport News Virginia. The Lyme bacteria can be passed from the mother to the fetus - this has been discovered through biopsies of umbilical cords and from miscarried fetuses.
I will also note that it is quite possible for her to have all 3 of the problems I note above - I do and they can all be managed with alot of vigilence and being very pro-active in protecting her health by strengthening her immune system.