She is one of 12 new players in the team and the only representative from Otago.
But her former provincial team-mate, Victoria Subritzky-Nafatali, only switched allegiances to Counties Manukau in January this year, so she has at least one tight ally.
The Black Ferns are in a rebuilding phase. Several senior players retired following last year's World Cup and the side has also been weakened by injuries.
Sisifa's call-up is well deserved, though. She was a standout player for the Spirit, which finished mid-table in the national championship.
Her explosive runs from the back of the scrum and ruck got her side on the front foot and she rarely missed a tackle.
Those skills should serve her well on the tour of Canada later this month.
''I feel like we've got a nice group of experienced players around us to keep the standard and to show us how it is done,'' Sisifa said.
''You can't expect to be too amazing with the amount of new caps we've got but we're going to try our best to be.
''We understand that we are in a rebuilding phase but we are excited about it. It means that we can go out there and put everything in and not have any pressure.''
Earlier this week, former Highlanders coach Glenn Moore was named to replace coach Greg Smith as Black Ferns coach for the tour.
Smith stood down from his role after he was banned for 14 weeks following a sideline dispute with a referee in Waikato club rugby.
Sisifa declined to comment on the issue but was looking forward to the tour.
''I can't really comment on any of that too much. But all I can say about the girls ... is it has not really affected us. We are just going to focus on the tour and being able to control the things that are in our control like how we prepare.''
The Black Ferns open their campaign against Canada on June 27.
They play England on July 1 and complete the tournament with a match against the United States on July 5.
