I think it can largely depend on how well you write POV for your character. That can determine how well your audience understand the name changes that have taken place.

One consideration... if you are writing from her POV, have you considered that maybe she will be confused by the name changes as well? That way you can have some internal monologue over her not realising she's been called and also some added punishment scenes over her ignorance. That way the audience get the chance to get used to the name changes.