Nothing of that kind. She is in no dependent relation to the boss at all, no force, no intimidation, nothing. She even put his dress on before. You can't take (fake) juridical categories to make her a victim and in the next sentence give her agency on a moral level.
While I agree, there is no force; there is intimidation. The whole point of the dinner was for the couple to explain their ideas that were going to save Hutch's job, now technically the job hasn't actually been threatened here - it's just in the couple's head, but they think they need to express these ideas to Christian - the boss runs with this and says okay, because he sees the prize of Vivian - even going as far as to say no Vivian, No dinner - again while he hasnt at this point threatened the job, he knows what both Hutch and Vivian are thinking this dinner is a their only chance and is threatening that. Christian then tells Hutch not to bring Vivian, knowing full well she will fight to go, given what Christian told her before she even says it herself, "Something isn't right, he sent me this dress and then told me not to come. He's playing some kind of game, testing me" at this point through she feels she has no choice but to wear the dress thanks to the Manipulations by Christian
Christian actually does threaten Hutch's job later at night when he says the only way he will let them leave is if Hutch is no longer an Employee, ensuring that Vivian sleeps in his bed that night.
Of course, all of this is bullshit, as he later on confirms to Vivian that the consequences are in her head and she can leave anytime, but by then, the deeds have been done - at this point it becomes a little difficult to defend Vivian because shes been given and out yet fucks him on the kitchen table anyway - she should have walked away cause now she is not fucking for money, saving the job or whatever else - this time it is selfish
So yeah, Christian was clever here and used our couple's feelings and fears to extort them and get them into a position he wanted - vivian is definitely the victim at first... later however