She needs to follow up
with her doctor.
With her high blood pressure, and any other conditions she may have, she needs to work with her doctor. We can't offer medical advice to someone in this kind of condition.
If she still has a fever, and her CRP is elevated, and she is so weak, it doesn't seem like she is recovering.
Azithromycin is an antibiotic and won't do anything for this, unless she had another infection. Covid is a virus.