I would suggest that even if there is some slight risk you simply not accept the risk. In this case it should be fairly easy to apply mind over matter if you are not too brainwashed into believing that you might get sick from being around her. Some things are a lot more difficult to have control over when we have been brainwashed into certain beliefs our entire life.
Also remember that many people got the virus and the symptoms were fairly mild in most of them, so it never did become the scary pandemic they were trying to make us believe it was, so even if you get "swine flu" you would most likely not be sick for long.
How nice of you to try to help her overcome any possible side effects of the vaccination with colloidal silver. I hope you enjoy your relationship with her!
Nancy