Because my mom is having allergic sniffles

Allergies...: Nasal allergies or congestion can be caused by different factors: environmental( grass, trees, plants, pollen, dust,etc),certain types of food, nasal tissue problems and sensitivity, irritants (perfumes for example), dust mites, among others. She needs to see her doctor to have medication, like antihistamine meds prescribed. I am not sure if you are able to get over the counter meds where you are.

Allergies.: That sounds like allergies. Nasal congestion, runny nose, cough, headache, facial pains and earache can be triggered by fragrances, dust mites (sweeping the floor), grass, trees, pets, environmental molds and such. There are outdoor and indoor allergens. OTC nasal steroid and nasal saline are worth a try.