Not even 1% benefit from corticosteroid.

The thing is that me and my mother both have allergic rhinitis. Her main symptoms are sneezing,runny nose, etc. And my only symptom is post nasal drip along with nasal congestion. The OTC sprays even in foreign countries like fluticasone and mometasone furoate are quite popular and majority of people globally benefit a lot from these. However, in my case I get no relief at all from fluticasone etc Even after using for a month..and even my mom only gets partial relief even after full adult dose. Infact even after 2 puffs of metaspray in each nostril once in the morning, she would again get symptoms while cooking food or from smell of some grocery items in the store during the day. But whenever we take tablet like cetrizine or montair lc, then symptoms are controlled 100 percent immediately..why is this happening? And why does it not work for us?