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It is not a viral infection but a bacterial infection as her TLC (total leucocyte count) has increased. Also, diabetic patients are prone to such infection.
Treatment is antibiotics, which she has been started by her physician. In most patients, this resolves with a week. Continue other medicines as prescribed. We should see a response in 24 to 48 hours.
If there is no improvement in fever, cough, or increase in her symptoms like increased shortness of breath, visit a hospital as her antibiotics will need to be escalated and she may need higher IV (intravenous) antibiotics.
If you have electronic BP (blood pressure) apparatus, then monitor BP twice a day. Excessive fall in BP or decreased frequency of urination are some of the warning signs.
Repeat TLC, urea and creatinine test to see antibiotics response. So overall, a majority of the patients recover well but some amount of risk is always there in such infections.
I hope this helps you and get back if you have any doubts.