She has to laugh all the time because she doesn’t know anything and what little she does know she can’t explain in a coherent manner.
The laughing serves as a distraction & it fills in time.
Joyful? Yeah right!.....she’s a stupid person trying to fake her way into the Presidency.
“The laughing serves as a distraction & it fills in time”
Exactly right. It’s a stalling technique while she thinks of what to say.
And it appears that she’s been de-cackled. Whomever is coaching her told her to “STOP IT”.