My fiance's 15 year old daughter slaps and calls me hurtful things to my face, yet he doesn't punish her. How can I approach this situation?

Anonymous
Since I moved into my fiance's house, his 15 yo daughter has been bossing me around, calling me stupid and dumb, and a few times has slapped me across the cheek. I don't get why she should hate me or do any of this, and I've tried to be nice and kind to her, but she's a spoiled brat, and every time I confront my fiance about this he makes up excuses for her, and refuses to even punish her for it.

How can I diffuse this situation or even just persuade my fiance to tell her to stop this?
My fiance's 15 year old daughter slaps and calls me hurtful things to my face, yet he doesn't punish her. How can I approach this situation?
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