It could also launch the bubbly teenager on the trail of becoming the greatest female Olympian of all-time with Soviet gymnast Larisa Latynina, winner of nine golds, a reachable target should she forge ahead to another couple of Olympics.
"It was so perfect in absolutely every way," gushed Franklin after the 4x100 metres medley relay, beaming her infectious smile and wholesome appeal right down to her red, white and blue painted toe nails.
Franklin swam the opening backstroke leg in the event.
"That was the most fun relay I've ever been on, and to finish off with a bang!"
She shared the Olympic pool with the incomparable Michael Phelps in what felt like a passing of the torch between the unparalleled greatest Olympian and the brightest new US swimming sensation.
Franklin acknowledged she could be following the trail blazed by Phelps, who ended his career with an unmatched 18th gold medal in Saturday's 4x100 medley relay.
"I don't think his shoes will ever be filled. I think his footsteps are just huge. But hopefully I can kind of make little paths right next to his," she said.
The high school junior from Aurora, Colorado, said Phelps has been an inspiration and helped motivate her through a demanding schedule.
She set a world record to win the 200 backstroke on Friday after winning the 100 metres backstroke and 4x200 freestyle relay and a bronze in the 4x100 freestyle relay.
"Just being able to get to know him on such a personal level and be able to cheer for him, to just watch him and everything he has accomplished, becoming the most decorated Olympian of all time," she said.
"That's so inspiring for me. It gives me so much motivation."
Franklin's love of swimming comes clear in how she described the thrill of being on the same Olympic team with Phelps.
"Just watching Michael swim is beautiful. Just watching what he does and how he moves through the water you can tell that he's meant to do it," she said.
"Just to see that and be a part of it and be on the team I think that's so special."
The perpetually upbeat Franklin conceded that after riding so high in London the end of her first Olympics competition was a downer.
"I'm going to miss this so much," she said. "I'm sad. I'm so sad it's all over. But I've learned so much from this experience."
Franklin brightened when asked about her future plans.
"Over the next four years I know I'm going to have so much fun," she beamed.
"I have my senior year (of high school) and I'm going to pick a college and go to college and I cannot wait."
Franklin would not be drawn into a prediction of how long an Olympic career he fans might be treated to.
"Hopefully I'll be (around) in 2016," she said.
In the 200m backstroke, Franklin led the four-lap race from start to finish to win in a time of two minutes 04.06 seconds, slashing three-quarters of a second off Kirsty Coventry's world record, which was set in a now banned polyurethane bodysuit.
Russia's Anastasia Zueva won the silver medal and America's Elizabeth Beisel the bronze but neither could keep up with the bubbly Franklin, who opened up a body's length over the field after just 75 metres.
Zimbabwe's Coventry had won the gold at the last two Olympics and was bidding to become just the third woman to win the same individual event at three Olympics but could only manage sixth place.
Britain's Lizzie Simmonds missed out on the medals after she was unable to maintain the pace which kept her in the bronze medal position heading into the final 50m and finished in fourth.
The 21-year-old remained rational after finishing in what she says is the most frustrating place to finish in an Olympic final.
"It was fantastic to be back down doing decent times,” she said.
“I did not have any other option but to go out there and race from the edge of the pool.
"Fourth is the worst place to come in an Olympic final. Most of the time in that race I just didn't know where I was.
“Something like that really makes you hungry. It is like saying you are on the edge just about there but not quite there."
- Michael Phelps