Strange blog post title, isn't it?
What was that? Had she really said /piːnɪsts/? Of course not! I listened to it again and there it was - a very short and weak schwa which made the big difference in meaning. Here's the section for you to enjoy!
Ms Burton-Hill was born on the 1st of July, 1980. According to Wikipedia she attended St Paul's Girls' School, which is an independent school, as this type is nowadays called (aka public school), and then The Royal College of St. Peter in Westminster. Next she read English at Magdalene (/ˈmɔːdlɪn/) College, Cambridge. Whether she holds a degree, I don't know. She is an actor, writer, journalist and violinist.