Yep it's UK Snowflake for that one, and I love her too she was my first UK pony back when I was about 10. That was a one point question too by the way.
While we're on the subject could you all look in the other thread and let me know how you feel about having questions every 12 hours...would 24 be easier? It mean the trivia will take much longer to run through but I'd like to know what you all think. So if you could all scoot over to the http://www.mlptp.net/forums/mlp-discussion/44634-mlptp-trivia-discussion-thread.html and let me know that would be great!
Probably a bad guess... but the 2 other differences in the Mexican princess ponies, are they came with baby dragons, instead of bushwoolies. And the ponies names were different.