"We're just about ready to say 'we're open, we know what we're doing'."
She said the organisation was focused on building resources until more funding could be secured. The One SPCA proposal could be a huge boost to fundraising efforts.
Ms Midgen said One SPCA would also be a great opportunity for the "wealthier" centres to assist struggling sites.
"Just because a centre is poorer doesn't mean they shouldn't get funding," she said.
If the proposal went ahead, volunteers and workers would be "locked" into their positions and placed into the new organisation.
Since the re-opening, the Waikato centre had been taking "very small baby steps" and things were progressing slowly but smoothly.
Ms Midgen said it was important the Waikato centre should "take it slow and get it right".
"We're very conscious that we won't get another crack at this" said Midgen.
In the meantime, she said Waikato volunteers and SPCA New Zealand were doing everything they could to keep tails wagging, the welfare of the animals being their first priority.
Midgen said it was important to keep the Waikato centre operating, as it was the "third or fourth" largest centre in New Zealand in terms of "animal volume".
"Waikato is a really important part of SPCA because it is a large area and there are a lot of animal issues in that area" said Midgen.
In 2015, the centre accpeted 2600 animals in need, and responded to 1000 callouts in the Waikato region.
The merger would be put to a vote at the AGM in June, and no action would be taken until November 1.