Easy Peasy...
Instruct your friend to tell her family that...
1. She would love to take the vaccine, but she is in the control group and her taking the jab would mess up the data...
2. She is waiting for the vaccine in pill form...
3. She tested positive for something (PCR) so she must have natural immunity. No shot required.
4. She is waiting for an ACTUAL vaccine
This is crazy—the family is telling her she is their slave—and now she is supposed to them the reasons why slavery is not a great idea.
No way!
They are Pfascists who think they own her.
There is _nothing_ to discuss.
Slavery is _never_ OK.