She said: "I think the most important thing is always to come out the winner, regardless of how I perform.
"Tonight was fantastic. I had to dig deep and produce a career-defining performance to actually win."
Katie then applauded her opponent, saying: "What an amazing champion Amanda is, she’s a phenomenal fighter and we definitely got the best out of each other. Coming into this fight, they were saying it was the biggest fight in women’s boxing, but I think it exceeded it."
She continued: "It was a special, special moment, the best night of my career.
"I was not sure if anything could reach my Olympic gold medal moment, but tonight was absolutely the best moment of my career."
On some of the more challenging moments during the fight, Katie said that she "wasn't worried".
"I knew it was a tough, tough round and it was Amanda’s round," she said. "But I wasn’t concerned and knew I was ok and stable coming back to the corner."
She added: "I just had to regroup, reset and I actually won the next round, I believe. So regardless if it was a tough round for me or not, I always come back and show the heart I need to actually come through them."Explore more on these topics:
