I agree, listening to her tonight I thought it was some of the most powerful testimony the prosecution could have used and am so sad they didn't put her on the stand.
Anyone including this jury who gets nervous in front of cameras or even behind them could easily understand the nervous laughter. In my opinion it just makes her that much more "real" and credible. She isn't putting on a show, just coming forward with what she saw even if it does make her nervous.
ETA: This was the first testimony I heard of Caseys infantile behaviour, to the point of asking Tracy to wear a wristwatch around her ankle just like Casey had to wear a "bracelet" on her ankle. Also the points of the baby books and smiling when Tracy told her "we will never find Caylee will we?"...
The saddest thing the jurors DIDN'T hear was the argument between GA and ICA on the first morning, where GA was demanding to know where Caylee was and KC telling him to quit acting like a cop.. THAT alone could have turned the whole verdict from what we are hearing from the jurors who are talking.
ETA AGAIN;; I also think Tracy's theory makes the most sense... the duct tape was added when she went home and backed the car into the garage.. it was an "afterthought" To make the chloroform accident look like a kidnapping. The only part I don't agree with is that the body was in a bag in the trunk the whole time.
I truly think the body was placed in the car after the chlorofoming and then when KC realized she had made an "oops" the body stayed there for a couple of days and then started smelling.. At that point, she backed into the garage (this was withing 3 days) borrowed the shovel, used the shovel to remove the body from the trunk and place it into the bags..
She cleaned the shovel off in the backyard before returning it to the neighbor.. (decomp in the backyard).. yet still kept the body in bags in the trunk until the gas can incident which scared her enough to dump the body.