Arna will go into surgery again on Monday to assess if the grafts have taken.
"At the moment she's just being kept really clean and really still and they're just hoping the grafts will take," he said.
"If they take that will be a major step and if they don't the surgery will have to happen again."
He said it had been a "long weekend" for the family, especially Arna's mum, Penny, who had stayed at her bedside.
The rest of the family will join the pair this week to celebrate her brother Seb's fifth birthday.
"They're all going to be up there together and have a little bit of a party up in the hospital."
Mr Hopkins said it was something Penny was really looking forward to.
"We know she's eventually going to get out of there and get home, it's just a long, long road until then."
Meanwhile, people around the country are rallying to raise funds for the Hopkins family.
The Support for Arna Facebook page has nearly 15,000 likes and many messages of support and notices of fundraisers around the country.
Donations can be made to: Support for Arna, National Bank a/c 06-0689-0298651-00 or search "Support for Arna" on Facebook.