"I am so chuffed to have had a great competition and achieved personal bests in most events," stated the teenager.
Arlen, who was paralysed in 2006 by a virus that affected her spinal cord and also left her in a vegetative state for two years, was deemed "ineligible" for the Games by the International Paralympic Committee on the eve of the competition, but
later won an appeal.
"It has been a rollercoaster ride, especially after the last few months," admitted Arlen.
"I don't even know how to react [to gold], I am in shock and I just wanted to go out there and give it my all."
won Britain's first medal on the final night of Paralympic action at the Aquatics Centre with bronze in the SB9 100m breaststroke.
It was an incredible achievement by the 21-year-old, who has Beckwith-Wiedemann syndrome - a type overgrowth disorder - as just four months ago she spent time in intensive care due to her condition.
finished fourth in the SB9 100m breaststroke final in 1:10:40, but he was a full three seconds off the medal positions, which were led by Russia's Pavel Poltavtsev.
Bridge returned for the breaststroke leg of the men's 4x100m medley relay team with James Crisp, Sean Fraser and Thomas Young, which was a revised line-up to that which qualified quickest for the final.
However, they found themselves down in fifth after the first leg and could not claw that back, finishing in that position in 4:20:54.
China took the final swimming gold of the 2012 Games with victory over Russia by four one-hundredths of a second, with Australia completing the podium.
Great Britain finished the London Paralympics with 39 medals in the pool [seven gold, 16 silver and 16 bronze], two short of their Beijing total and with four fewer golds.
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