Medical journals have long noted cases of people who emerged from yearslong comas. And medical studies of hypothermic cardiac arrests in Norway have explored the cases of patients who survived after their core body temperature dropped to 56 degrees Fahrenheit and they spent nearly seven hours in that condition.

She plans to return to work as an English-language teacher in Barcelona on Wednesday, but before that she will try to go for a run this weekend, she said in a phone interview on Friday.

Ms. Mash remembers nothing about the traumatic experience. Her last memory before waking up in the intensive care unit is of heading off to hike with her husband.

“People keep asking me how I feel it has changed me, but I do not have the memory,” she said in the interview. “I never considered the fact that I might die. But it is different for my husband and parents — they were in a very stressful situation.” The couple believe that Mr. Schoeman experienced possible mild hypothermia that did not require treatment.

Born in Britain, she spent part of her childhood in South Africa, where she met her husband, and has also lived in China. The couple moved to Barcelona two years ago.

She is a keen hiker and tries to go to the mountains with her husband at least once a month, and has previously trekked in the Himalayas. Doctors said that her experience there might have helped her to survive, in addition to her young age and active lifestyle.

The hypothermia has left Ms. Mash with some mobility and sensitivity issues in her fingers, which means she cannot do buttons or put earrings in on her own, she said, but she hopes that will improve.