I think this is another case of your pitch being lower than necessary, yet your tone and delivery carrying the audition in spite of that. Delivery in particular is quite distinct in its emotional peaks, as the pacing matches how quickly the character's mood can shift in the lines, especially in the second one. Tone here is also appropriate as you come off as both a rational woman of science while hiding part of that manic obsession beneath it. The English accent also helps to sell your voice as somewhat snooty, which helps the paranoid sections come off as more offsetting for the character as well.