How we cite our quotes: (Chapter.Paragraph)
Quote #4
Then I was dancing! They insisted. […] I felt free—a weightless astronaut, Carol Burnett without her fat suit. My long, gorgeous hair rocked from side to side. (11.196)
Dolores feels like a different person because she's acting like a different person: carefree and happy. She's not just weighted down by literal weight, she's weighted down by emotions, and letting them go helps her feel lighter, if only for a bit.
Quote #5
"Not with that hippopotamus!" (13.29)
For Kippy, when she sees Dolores, her roommate has transformed from someone like herself into a grotesque monster. For Dolores, Kippy transforms from a decent human being into a total jerk.
Quote #6
I was allowed to become [Kippy's] loyal, devoted servant. […] By the second week, she'd started calling me Dee instead of Dolores. (14.1)
Dolores only tends to get a nickname from people who are trying to manipulate her. Jack calls her Dolores del Rio, transforming her into a sex object, and Kippy calls her Dee, probably because she's too lazy to sound out her new servant's entire name.