Antibody positive means she is euther having or Had covid . U need to see for the specific antibodies in the report. If she is IgG only positive then its a past infection. If she is positive for IgM also then she is having acute covid illness. RtPCR sometime comes negative. As she is having symptoms , she require treatment based on her symptoms and her inflammatory markers.
Next Steps
Consult with a physician with detailed history for investigations and treatment.