Very friendly. Plus, she's been the director of admissions for Lauder since the programme started, and in her 20 (?) years doing admissions work she's seen all sorts, so she's definitely not trying to 'trick' you.
I had my interview on Monday with Marcy. Marcy was very nice and professional.
Somehow, it was a quite short one, just about 20 minutes. and she did not ask many questions, instead I talked quite a lot. I did not have any clue whether I performed well or not.
Also, Marcy did not take any notes during the interview, she said she would do it after the interview.