"We had to keep making more because they eat a lot."
The Japanese coaches discovered the sushi shop during last year's festival.
"They asked if we could make some lunch for the players."
She said there was not much selection for Japanese players so when they found a sushi place they liked, they stayed loyal.
"Fish and chips and hamburgers are not really for them. They remembered I was here so asked me to provide all the food for them this week." The girls eat it before and after games, and for much of the tournament it had all been "victory sushi".
Mrs Yamaguchi had formed a very close bond with the players during their stay.
"They are very well mannered young ladies, it's a pleasure to support them."
To celebrate her 51st birthday on Tuesday, the team signed a card and sang for her.
"It was very special."
The Japanese native has made a habit of helping her fellow countrymen feel at home when touring the Bay.
When the women's basketball side toured in 2009 they too flocked to Mrs Yamaguchi to get their sushi fix and during the 2011 Rugby World Cup, she provided sushi for head coach John Kirwan at a press conference.
"He liked it and he signed a hat for me." Mrs Yamaguchi's family was sports mad and she too was taking more of an interest.
"I knew nothing about rugby but because I had the connection with the Japanese team I started and now it's the same with the hockey."
Not yet an expert on the rules, Mrs Yamaguchi said she would "study more before Rio".
