Covid can be treated at home unless she develops severe symptoms. As she does not have any severe symptoms, home treatment will be sufficient for her.
Some steps to take are:
Home isolation: this is of course the most important. She needs to isolate for a minimum of 5 days. She can end his isolation on day 5 if she has been symptom free the previous 24 hours. However if she has symptoms at that time, she is required to isolate till day 10.
At home also she should maintain minimum distance of 6 feet from other family or friends and also wear a mask when she is around someone. Also she should take care to disinfect his hands frequently.
Hydration: she should take care to have at least 2 Liters of fluid in a day.
Regular monitoring of temperature: three times a day. Get a thermometer if you do not have one.
Monitoring of oxygen saturation by pulse oxymeter: this is available in all pharmacies, monitor it three times daily, she has to report to the ER if it goes below 94%.
Tylenol: for feverish symptoms and headache, she should take 500 mg three times daily.
Cough syrup: for cough she can use OTC cough syrup like Benadryl.
Vit. C supplement.
This will be enough, but if she develops any severe symptoms she must go to her doctor or to the ER.