One image shows her stood on crutches in a hospital gown with her injured leg in a metal splint, captioned "getting stronger every day".
Melissa Cochran's brother Clint Payne said on Thursday through a verified GoFundMe account webpage that she was "getting stronger every day!"
The couple had been visiting Melissa's parents, who were serving as missionaries in the London Church of Jesus Christ of Latter-day Saints, when they were caught up in the attack.
He died of injuries sustained in Masood's vehicle attack on Westminster Bridge, as did British mother Aysha Frade and pensioner Leslie Rhodes.
"Talking with loved ones at home is some of the best medicine", says the message posted with the update. She is so grateful for the outpouring of love and generosity.
Melissa Cochran in hospital and (right) with husband Kurt before the attack.
"So many people have been so kind, and we are deeply touched by their goodness and generosity". His attack initially killed Cochran and two British nationals, and injured dozens of others, at least one of whom has since died.
Kent-born Masood, who lived in Birmingham, earlier mounted the kerb twice in a Hyundai auto as he sped across Westminster Bridge.
"The most hard part of all this is that Kurt is no longer with us and we miss him terribly".
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