If she's still actively sneezing then that's a sign that it's not just "she's getting old" or any other natural explanation for her sleeping a lot...She still has an upper respiratory/sinus condition, and when you say "now she has cataracts", they don't develop that quickly so that they'd be visible within a week or two...I've never heard you mention "cataracts" before, so if this is something that has just popped-up in the last week or two, then it's probably not "cataracts", but rather horrible conjunctivitis in her eyes, which is a major symptom of Psittacosis Chlamydia...But if you could post a photo of her eyes so we could see what you're talking about it would help...
As Laura already mentioned, I think she either has Psittacosis Chlamydia and she was given the wrong meds to treat it or not for a long enough period of time to get rid of it, or it's some other kind of infection and the meds she already took were not the correct meds...
This is what happens when Vets don't do the proper testing to get a diagnosis and prescribe the correct meds...and if it is Psittacosis, the treatment needs to be 45 days/6-7 weeks long to get rid of it completely....And at this point I think you'd be best to give her the oral antibiotics by Nebulizer, so that the medicine gets right into her lung/respiratory tissue.
I think it is Psittacosis based on the upper respiratory and eye symptoms, and sometimes it requires a combination treatment is required to treat it, meaning Doxycycline and Azithromycin together, plus an antibiotic eye drop and then also a Probiotic supplement to prevent a Fungal/Yeast infection from developing from all the antibiotics...It's mostly likely that she didn't get the meds for a long enough course (if I remember correctly she was on Doxycycline already, but only for a very short course), and again it needs to be 45 days/6-7 weeks, every day, to properly eliminate Psittacosis Chlamydia...Your Vet needs to properly diagnose this though, through upper respiratory cultures and blood work...
