I'm not an ENT by any means however, I do have some relevant experience. After only 3 months with an ENT and only antibiotic therapy, surgery is a big leap. My son had chronic sinusitis, the yucky, always green from one nostril kind. I took him to Riley Childrens hospital. AN MRI (have you had one) showed that the bony opening to the sinus on one side was NARROW. The location was closer to his brain than not and drilling that out does have a risk of pierceing the brain. It's rare....but then we're a lucky family

(We get everything)
The doctor put him on oral Cleocin for four months (not without it's own risks) and then like clockwork, 4 times a day, the little fellow (about 4 or 5) would stand patiently while I took warm saline, buffered with a precise amt of baking soda, put it in a waterpic, put the jet up each nostril and irrigated each nostril until he got saline in the back of his throat (set on very gentle pulse) we did that four times a day for four months and he never complained once. He did say the Cleocin tasted like "monkey pee". Could never figure out where that reference came from.
I don't know many adults who would tolerate that, I don't think I could do it faithfully.....maybe you could get your MOM to do it...you know how we are about our kids.
This has to be done under instructions of a physician and I guess pediatric ENT's care more about avoiding surgery for thier patients, and ENT's probably find few adult patients comply. You might share this with your ENT. My son is 24 and even with his narrow passage has never had another chronic bout. He used to be at the doctors office every month. He hasnt had an appt for illness in 7 years.
there's no risk in talking it over with your doctor who can prescribe the correct measurments and type of salt and baking soda with instructions, and of course an appropriate antibiotic (have her culture whats growing there first) Hope this brings you some relief.
August