Drysdale had to settle for bronze at the 2008 Beijing Olympics after falling sick in the days before his final.
Ms Owens was impressed with the way her son raced and his ability to keep his pace up over the whole 2000m.
"I felt it was a very different race to anything Mahe had ever done.
"Mahe just stayed ahead the whole time. He just kept pushing. I just found it amazing that he had the energy to do it."
Drysdale had a large support crew cheering him on with many of his aunts, uncles, cousins and friends flying to London to see him race but Ms Owens says it was not just Kiwis urging him on.
"People from all over the world have come up to me and said, 'I just want Mahe to win. He deserves it'. It was a really, really popular win," Ms Owens said.
Even while they were having dinner to celebrate the victory, Drysdale was being mobbed by English people wanting to congratulate him, she said.