Waetford believes the rules are not a bad thing, but being told of them three weeks out from the start of NHL is.
"I'm not unhappy with it. I think three weeks is not enough, and particularly they did it after you'd selected your team - who knows you may have chosen to pick more attacking players?" she said.
However, what was done was done and Waetford was taking a practical view to the news.
"Just get on with it. I certainly gave them feedback on how I felt, and they'll just say everyone is in the same boat."
Hockey New Zealand high-performance director Terry Evans said it was a good chance for players to have extra time adapting to the change.
"The decision to play the new format at NHL is a no brainer for us. The FIH will change the rules at their international competitions from September 1, so we need to change our rules at a domestic level to give our players and coaches the most experience as possible
"This is quite a big change and it will be exciting to see the impact the new format has on games. It's expected to be more spectator friendly, help television ratings and commercial interest, and will speed up the game.
"Playing the new format at NHL gives us a good jump on the rest of the world in terms of preparation, especially with the Black Sticks Women heading off to Champions Trophy in three months' time."
To get used to the new rules ahead of next weekend's opening round, Northland will play two games in the next week with the changes.