This is her first Olympics
Japan has competed in the Olympics since 1912 so that's 100 years exactly :)
he competed four times
Australia has been in every summer Olympics and some of the winter Olympics.
3 or more or less
Prince Albert II of Monaco competed in the Bobsleigh several times.
Qatar has competed in the Olympic games 8 times. The first year they competed in the Olympic Games was 1984, and they have participated in every one since then.
The 2012 Games in London will be the 8th time Seychelles has competed in the Olympics. The first time Seychelles competed was the 1980 Games in Moscow.
New Zealand has competed in 23 Summer Olympics, the first being in 1908 combining their athletes with Australia's and competing under the name Australasia. New Zealand has competed in 13 Winter Olympics, the first being in 1952.