All kidding aside; although she has gotten rid of the target does not mean potential cancer cells are not there; she can still get the cancer, it just will not be in the breasts but can and could be elsewhere. She still has to worry.
It is far better to be proactive than to react to a potential risk in such a drastic barbaric manner. At Jesicha's Hope we received many inquires as to how to prevent rather than to chop off parts of the body. We try to show people there is a more intelligent approach that saves lives and body parts.