Lacey likes to reapeat what we, students, say during the class as a some sort of teaching tool.
For example,

I: Doesn't that have to be revolved around x-axis?
Lacey: Yeah, Jeongsoo has a really good point! That does have to be revolved around x-axis!

Sometimes, she adds her own spin. In other words, she often exaggerates( or often euphemizes) what students say.... like this:

I: Can you let us solve this probelm by ourselves (I tend to say 'we' and 'us' intead of 'I' and 'me' ).
Lacey: Jeong soo says, leave me alone! so I let you do this by yourselves.

It could be her own way of her discontentment with something unknown felt.