Hello This could be due to dryness Try A reduce screen time B. Cold compresses help C. Give her ARC glasses D. Lubricating eye drops like lubrex helps Also, get her eyesight examined

Please follow these general instructions 1.Frequent blinking of eyes 2.For every 20 minutes look far away for 20 sec 3.Drink more water 4.Do not sit in front of air conditioner in car or room 5.Take Adequate break in between 6.computer screen should be 16-30inches away 7.ensure the screen is neither too bright nor dim 8.get good sleep 9.cold compression with any wet gauze in case of eye strain 10.ensure there is no glare from your screen.