"It went really well. Probably doing the overall title for the Masters was best."
There was a large contingent of Americans, Europeans and about 130 Australians who took part in the men's and women's competitions.
Dixon was one of 22 New Zealanders, most of whom got top placings.
Natural bodybuilding has stringent rules with all competitors drug tested while in competition.
After the show, Dixon and her fellow Kiwis headed out to see the bright lights of the famous Las Vegas strip.
"You don't have to go far, it's a pretty crazy place."
Dixon stayed in Las Vegas another week to compete in another show - the Muscle Main Event - but did not get a placing.
She will now take a break over summer, before looking to return to competition around May in order to qualify again for the world competition in June, although she will have to arrange finances to make the trip to Hungary.
Dixon thanked City Gym trainer Pat McNamara for "putting up with me" to get ready for Las Vegas.