First advice, if the patient is feeling well please let the patient rest, weakness in covid takes time. If the oxygen levels drop consult a doctor on priority.
Now for the rest of her recovery and current situation, need to see the test results to define next steps. If you have any of her reports please share and we can go over these to find out where the issue is.
Next Steps
You could book a consultation through Practo: https://www.practo.com/meerut/doctor/rajesh-kumar-gupta-general-physician-1