There could be several reasons why Jill said she liked to dance even though she didn't.
Social conformity: Jill may have felt pressured to conform to the opinions of her classmates. She may have been afraid of being seen as different or unpopular if she admitted that she didn't like to dance.
Fear of negative feedback: Jill may have been afraid of what her classmates would think if she admitted that she didn't like to dance. She may have worried that they would make fun of her or judge her.
Desire to be accepted: Jill may have simply wanted to be accepted by her classmates. She may have thought that saying she liked to dance would make them like her more.