My girlfriend won on the price is right and now she doesnt love me

My girlfriend called me tonight after going to see a taping of the price is right. She called me overjoyed telling me she just won $63,000 worth of prizes, including a brand new jeep wrangler, 16 thousand dollars in cash and a 7 night trip to Brazil for two. We have been dating a year and when she called me to tell me about her prizes, I assumed that the second part of the trip to Brazil was for me. I asked her in the heat of that excitement, "So when are we going?" And she told me that she is "prolly going to take her sister" Although its nice that she wanted to take her sister, I can't help but feel bummed out by this. I have thought about it a lot and I realized that I am not that happy she won all of that money. I feel that in a moment of such excitement your true personality comes out and if you were offered a free trip to Brazil, if you truly loved your partner you would take them. If your sister is the first person you think of for such a romantic type of thing, then I have to conclude that my girlfriend is just not that into the relationship. I need help someone please give me advice