Disclaimer: This should not replace any medical advice you get from a professional you trust, just my experience taking care of someone who got covid pneumonia.
My relative got covid pneumonia and was recommended to sleep upright by a doctor found on FLCCC. If possible have a "zero-gravity" chair or recliner to try to get some sleep that way.
Also to do something called the prone position (as explained by a doctor here: https://youtu.be/z2VaS-exhlg) where you get on your knees, bend down, place your hands in a way that you can rest your forehead on them which allows your back to form a 45 degree angle and get things moving inside your lungs. It is important that all parts of your lungs (alveoli) get oxygen. I think part of the reason why your wife got some temporary relief using the albuterol inhaler because it helped those parts of the lungs get some oxygen but then the lung secretions resettle and blocks the alveoli again.
Do you have an oxygen saturation meter? also known as an oximeter. If not, buy or borrow one so you can monitor. Everyone is different so you might have to do more research on what the minimum oxygen saturation percentage is for your wife. If it goes below that often/consistently you may have to go to the hospital.
Also, look into cistus tea. Diet is important, bone broth and things like that. Lots of tea, licorice root, cinnamon, lemon ginger.