It appears that your mother has developed sunburns over forehead region leading to reactionary swelling over these areas. As eyelid skin is loose hence swelling is more prominent in eyelids. Most of sunburns are superficial and tend to heal within 3 to 5 days.
Deloday is non sedative anti allergic medicine which will help in relieving the itching and stinging feeling associated with sun allergy
part of sun damage to sensitive skin. Also when any burn heals it gives itchy sensation in the healed areas for few days to weeks depending upon the severity of depth of burn. So continue its use for few days.
An emmolient cream massage
of sun damage area for few weeks will help relieve symtoms of pain, itching and dryness in the affected region.
Of course avoidance to sun exposure and sun block cream use whenever it is must to go out in scorcing sun is a point of common sense as repeated sun burns can cause serious damage to the skin.
Consultant Cosmetic and Plastic Surgeon