"The review was fairly confronting and challenging and I can't really imagine being in the right frame of mind to help this side during the upcoming Rose Bowl series.
"I love the players; I love the team and I love the job – but for everyone's sake I think this is the best course of action at the moment."
Head of High Performance Bryan Stronach said NZ Cricket accepted Tiffen's request and would provide support for her during what was clearly a stressful time.
"The high performance environment is an extremely challenging one and the most important thing we can do right now is make sure we support Haidee," he said.
"We totally respect her position and will work through this with her."
Stronach said Tiffen would remain on her contract until its expiry date of July 31, and had been encouraged to reapply for the position.