@Steerpike No, she doesn't. I am researching Freemasonry and you don't have to keep your membership a secret. You just must not reveal any of the secret practices of your organisation.
@TheOneyouwerewarnedabout The United Grand Lodge of England, of which I am a member, is men only. There are however two Grand Lodges in England that are for women. The Order of Women Freemasons and Freemasonry for Women.