Does she eat a lot of foods with a lot of preservatives like msg? Does she use diet drinks or diet foods? Does she eat greasy foods or fast foods or junk foods?
The less ingredients the healthier the food is.
she might even try eating organic as much as she can.
She maybe should try eating homecooked meals with little prepacked ingredients and lots of fruits and vegetables.
She might even try going to a chiropractor that is into alternatives because they can get to the root of the problem instead of masking it with pain relievers.
here is a good website that you might find helpful
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