I'm guessing she has decided not to have children so as to not pass this along to another generation. If she doesn't have a companion now, I have to wonder how you tell someone you meet and want to have a relationship with that you no longer have breasts. It would be tough no matter how understanding that person may be.
See post 233
I do still have breasts. I just don't have "breast tissue" inside of them. I have been happily married for 35 years. However, I believe that anyone who had to face a prospective husband with this information would find out quickly if he really loved her and if he was worth loving. BTW, men can have breast cancer, too.