Breathing problem. Above 90) at home.

Hello Dr My mother is having breathing problem she was admitted she was suffering chest infection and bloated lungs blood culture was done it is pseudomon they gave pepar iv 3 times for 10 days she was given steroids and Budamate and duolin nebulizer was given  after then also she is having breathing problem and infection is growing after discharge they gave linezolid 600 for 5 days but no use. due to breathing problem they told to keep oxygen cylinder at home. is there any solution to avoid oxygen cylinder ( keeping saturation level above 90) at home. She is having CKD thyroid diabetic, vasculitis Please guide me Dr. Current medicine Pulmoclear 1-0-1 Montair Fx 0-0-1 MMF           1-0-1 Wyslone 2.5 1-0-0 Amlip 5   1-0-1 Aztor 10  0-0-1 Human actrapid 10-10-8 Lantus 10unit at 10pm Erthropoietin 4000 weekly Budamate inhaler Dytor 40 1-0-1