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It is true that chronic dry cough can be a sign of AIDS, however chronic dry cough can be also caused by many factors - can be allergy, post-nasal drip, acid reflux, asthma, allergic rhinitis, sinus infection,smoking,etc.
She needs to do chest X-ray to help find the cause. If you suspect HIV infection, both of you need to get tested. You cannot diagnose AIDS based on a single symptom.