Southby was widely criticised for her selections and rotation strategy, while her record of winning just six of 18 games across the Ferns' most recent international season (including 11 straight losses to Tier One nations Australia, England and Jamaica) led to calls for her sacking.
Further confirming New Zealand's recent demise in the netball world, the Ferns fell out of the top two of the Netball Federation rankings this month for the first time since the rankings began in 2008.
Former Silver Ferns coach Yvonne Willering has urged NNZ to veer away from taking the easy road, saying now was the time to make an "honest" statement.
"If they remain status quo, I think people will be dissatisfied," Willering told the Herald on Sunday.
"I think Netball New Zealand and the board need to be pretty intent in making sure it's done right.
"In the past, with player reviews, they've not necessarily been totally honest, as their own position in the team was at stake, but I think now is an opportunity for some honest evaluations.
"We're all waiting to see what steps we're going to take going forward [after the review]. Now it's a situation where you have got to provide solutions," said Willering.
Southby could not be reached for comment.