I am 'The Iron(ing) Lady!'

I've not seen the Thatcher movie yet but I am a fan of Meryl Streep, in this article of an interview she jokes:

So in what areas of her life can she be an Iron Lady, we asked. “Can I be an iron lady? I am an ironing lady. That is what I do. I do this,” she wittily replied and then started pretending to iron.