Hello. Ground glass appearance shows the inflammation that has occurred in the lungs due to the virus . Her oxygen levels are low which means there is still some amount of inflammation going on. Also oxygen level usually dips down at night in such patients due to complete relaxation of all muscles of the body including head and neck which causes decreased air to enter . This can be treated with some medications
Next Steps
Kindly consider for a personal video or audio consult with me for more detailed explanation , would like to know her treatment and would modify her treatment accordingly and for sending the prescription