She was born in Wainwright Alaska, to Alyssa and Matthew Roberts. Alyssa was a native born Alaskan, she met Matthew when he moved to Alaska to become a bush pilot. When Alyssa went into labour with Eirlys, she was a month early, and entirely unprepared, it was the middle of winter, and they was a blizzard. Matthew, hoping he had time, drove her to the airport, but on the way there, the car veered off the road. Eirlys was born in the car, during the blizzard, Alyssa chose to name her Eirlys because the name meant, snowflake. Little did her mother know then, how fitting that name would truly be.
When she was 9 her father moved them to Prudhoe Bay, where there were more work opportunities. She was quite happy there, but as she neared the age to start middle school, her parents decided they would start looking for a place to live in Fairbanks, where the school system was better. During spring break, when Eirlys was 11, they decided to use the vacation to drive to Fairbanks and check out locations. It had been a fairly light winter, and the weather seemed like it would be ok to make the drive, so they got in Matthew's Truck and headed out, about half way there, some unusually high winds set in, causing near white out conditions. Without warning, the road they were driving on became obliterated by an avalanche. The way the truck was buried in the snow, the front end was deeper than the back end. Her father carried a transponder (<----Not sure if that's what it's called, but the gps thingy that some people have in like planes and shit) with him at all times, that would give their location to rescuers, but even still he knew it could be hours or days before they get to them, depending on how deep the truck was buried.
Long, story short, they were buried in the snow for a few days (they had water in the truck, enough for a few days, so fresh water wasn't an issue), but the temperatures were insanely cold, and her parents died of a combination of injuries sustained when the truck crashed (avalanches tend to toss you around quite good), and hypothermia. This event, along with the fact that Eirlys was already starting puberty, sort of brought her powers out. However, after so many days trapped in the cold, her skin turned to a permanent grey/white colour and her hair white.