It's not often that a porn whore's demeanor, sexual willingness and figure come together quite so well! In Lucie's case, the fact that she is about as intelligent as a box of rocks also helped her become ideally suited to her job
I've seen the unedited version of one of the film's that she is double penetrated in where she is held down by the guy underneath her while another guy fucks her arse. She obviously distressed and complaining and struggling but they just continue. Her physical appearance has made her a sex slave.
It's pretty obvious she's been coerced into doing these films, I doubt very much she's getting the money, she'll be pimped and made to do it. The other girls arse to her mouth where she is heaving is not something she wants to do so it's not surprising she looks uninterested.