You can do a video consultation or share pics of your mother's eyes or book an appointment before going to any ophthalmologist. Better to show a doctor and then put any medication.

Hi ! Enough rest Less digital work / give a break for 2/3 days Use lubricating drops Good nutrition  .vit D , Omega 3 supplements Check up needed for power or any other issues in eye 

It May due to Allergic papillary conjuctivitis which on rubbing makes vision more blurr, discomfort. You can start Moxisure-LP eye drop 6 times in a day. And olopat e/d 2 times in a day and Lubrex eye drop 4 times in a day. Taper moxisure LP weekly.likes 4times next  week ,2 times  next week. And if you have other headache you have to check your refraction at nearest ophthalmologist. Also age is 60 years, if you have history of Diabetes and hypertention or other systemic illness, then you have check its status now. Or check at nearby your physician.