How to convince my step-cousin that she's not poor, but in fact an ungrateful spoiled girl?

She's only been my step-cousin for a couple of weeks. That's why you're reading about her now.
She has:
- An iPhone that has a $200 case made entirely of diamonds
- Google Fiber back home when she's not in California
- A private jet
- 2 maids
- A personal chef
- A theater
I talked to my aunt about my step-cousin, and my aunt immediately changed the subject to her dinner with some random family on TV.
How do I tell her that she's being a huge brat? She's always complained about on the news, and I'm trying to get her to fix her attitude so she can have a better reputation if her acting career takes off.

Added (1). So what you're telling me is that my step-cousin doesn't exist and that I'm hallucinating the whole thing. Sarcasm aside, I don't see a point in lying about having a bratty step-cousin. We all have bratty kids in our family.

Troll.

Tell her she's a spoiled little brat. Plain and simple. Honesty is the best policy