Can my wife use marijuana for her fibromyalgia pain after her retinal surgery?

On Aug. 5 my wife had retinal surgery in which the doctor put gas in her eye for the healing process, which is supposed to dissipate after several weeks. She is diabetic and has fibromyalgia as a result. My question is, can she take marijuana for her pain of the fibromyalgia without any effects from the gas in her eye?