since it's her

I need to work for Chairman Jang since it's her last day.
Necesito ir con la Presidenta Jang ya que es su último día.
My mother says that, since it's her house, as far as I live there, I have to do as I'm told.
Mi madre dice que, como es su casa, mientras viva allí, tengo que hacer lo que ella me diga.
Since it's her party, we have to talk to her.
Ya que es su fiesta, tenemos que hablar con ella.
Since it's her fault, you will not be punished.
Puesto que es su culpa, tú no serás castigado.
Since it's her first day, you should show her around the building.
Como es su primer día, deberías mostrarle el edificio.
Since it's her who left me, I don't think I owe her any explanations.
Como es ella la que me dejó, no creo que tenga que darle ninguna explicación.
Palabra del día
el guion