I certainly thought she sounded strange too but am not much of a conspiracy theorist.
I took her tentative and slow manner of speaking to be indicative of the subject matter.
Sean asked some questions I thought might have been tough for her to anwer and Elizabeth conceded that at one point and said she didn't want to talk about something.
There is something a little off about putting a young victim like that under the spotlight. I didn't enjoy that segment of the show even though I have so much compassion for the Smart family and all they have been through.
You're quite right. Sean should not have had her on the show. Too often it's ALL ABOUT HIM. Yesterday was one of those times.