"We were really nervous, we did not want her to make a mistake. But they played well and it was a thrill to see them hold on," Justine Sinclair said.
"It was absolutely incredible. We were leaping around the room, high-fiving each other."
She said her entire family were proud of the young netballer, including her two sisters, brother, parents, grandparents and relatives. Justine Sinclair admitted she was probably her daughter's biggest critic when it came to netball.
"I'm probably her number one critic and her father is her number one fan, he only sees the good," she said with a laugh.
"She made a couple of mistakes [on Sunday] but everyone did and she played really well. It was awesome."
Samantha Sinclair has worked hard to earn her place in the team and will be hoping for another start this weekend in the preliminary final.
Justine Sinclair and her husband, Jamie, were considering flying to Australia to watch the Magic live in the next playoff match.