Elizabeth is a descendant of the House of Romanov, the former Russian Royal Family that ruled both muggle and wizarding Russia. When the Russian Revolution broke out and the Muggle Royal Family were killed, the Romanov's who remained fled. Elizabeth's family lay low in Finland, only to flee again when the Red Army invaded again. The family stayed in Iceland from then on, until 2015, when they moved to England with their newborn baby, Elizabeth. It wasn't that her mother and father, Mary and Victor Romanov, didn't enjoy the picturesque land, but Elizabeth's obvious condition meant they couldn't stay in the Muggle village they called home. Elizabeth had changed her hair colour hours after birth, and while her mother was confused, her father recognised the traits of a metamorphmagus.
Living in the...mostly sunny south of England on the Cornish coast, Elizabeth was raised away from muggles, mainly because her parents still only spoke Russian and Icelandic. She learnt English from the famiily's squib housekeeper, but only got good at it when she went to Hogwarts. While her abilities were sign enough she'd probably have magic, her first show of it was at 7, when, after her father yelled at her for turning her nose into a pigs while they had (luckily wizard) guests over, she got angry back, causing a light to short-circuit, which made her father calm slightly, glad his daughter had magic. When she went to Hogwarts, the hat had a hard choice with her, her upbringing meant she could do well in both Gryffindor or Slytherin. Eventually, it went with the former. Her parents were supportive but distant due to the language barrier, with her speaking English so much she barely spoke her native tongue at home. However, tragedy struck when, while messing around at the beach with her friends one summer, a storm rolled in. Elizabeth was pulled out to sea by the current, but managed to hold onto a small outcrop of land until rescue came, though it left a fear of deep water in her.
After finishing school with pretty good OWLS and NEWTS, she decided to travel the world, much to her parent's disapproval. She used her abilities to help herself and for a few years went from country to country as a sort of bounty hunter, though she had a no killing rule. She ended her job in Russia, after a communist cult of wizards tried to kill her on learning her surname, believing her the last magical Romanov. She fought them off, and realised just how good she was at stopping others. Returning home, she discovered in her five years of absence, her parents had returned to Iceland. She stayed in the home in the UK, becoming good friends with the squib, who had been given the home as thanks by her parents. Elizabeth then decided she might as well try and make a life here, and planned to see if the ministry needed any more Aurors.