Rather gauche
A reader brings to my attention the website of Faimeh Burke, who is standing for Christchurch City Council. Her website is – www.ladyfaimehburke.org.
Rather gauche to use the title for political campaigning, when it is through marriage – and even worse to use it incorrectly. As she is not the daughter of nobility, but the wife of Sir Kerry Burke, the correct usage is simply Lady Burke.