I was waiting for a response from my parents about what their cat Lucey takes. She had lived me for a few years after my grandpa died, but became allergic, I swear, to the town I lived in. She was fine in Allentown, but when I moved to Bethlehem, she just got so bad. She was sniffly and sneezy all the time, and the vet couldn't get her any better living with me, he suggested having her go to my parents' place in the country. She's been doing much better there since she's been up there. She takes Prednisone on an as needed basis, and she also gets (I think this is what my dad said..) Dextromethasone. I know she gets a shot once a month during the summer.

She no longer sneezes blood, but she does get semi stuffy and her eyes get weepy when the meds wear off. She's a semi-smushy faced kitty, a tortie with one heck of an attitude. Maybe your mom's vet might want to try the Dextro stuff.