This is what happened to Aria...
Aria woke up at a small house seven years earlier, the day after Natalia had helped her escape. She did not know how she reached here or where was she?
A woman was taking care of her and when she saw Aria was up, she asked how was a little girl found floating in the river?
Aria truthfully did not know and she thought it would be better to keep information about herself a secret, so Aria found the easiest way alive. She said that she remembered nothing. Nothing before she has woken up. She pretended that she had Amnesia. Though it was not very convincing, the couple bought it.
The man was a fisherman and his wife took care of the home. They were not rich and managed to barely get by. Apparently the man had found Aria floating in the river when he went in the morning to catch fish.
Aria also found out that she had somehow arrived at the water kingdom as everybody here had blue eyes, everyone except Aria of course. But the people here did not seem to mind it. The couple lived in a small village which was far away from the capital and was not very rich. Aria at first decided to stay only because she thought this was the best place she could be, but soon she grew fond of the old couple. They were childless and loved Aria like her own daughter. So she stayed.
Aria had told them her name, just her first name. Though she wanted nothing to do with her past self, she could not give up on the name. Aria told them that she only remembered this little detail about herself.
The couple's names were Victor and Sonia. They took Aria in and told her that she could stay there as long as she wanted and could leave when she felt like this wasn't where she belonged.
Aria stayed there and in the first few weeks, everyone in the village absolutely loved her. Though she did not speak much, she was a well-behaved child who had quite a bit of knowledge.
Slowly but surely, Aria began to feel more and more like home. Though she never forgot her mom, dad and two sisters, Aria decided to live her with Victor and Sonia until she was strong enough to defeat every single person in the fire kingdom. Aria helped Victor with fishing and Sonia with the household work. She even helped out some of the villagers. Everyone had grown quite fond of her and Aria had also opened up to them. She had slowly begun calling Victor father and Sonia mother. She could not call them mom and dad but they were definitely people Aria loved deeply.
So, Aria has been living in a small village in the water kingdom ever since. She practices by herself and has become quite efficient in bending the elements. Aria made sure to only bend water in front of other people, and always, always hold back. But the people were still awed by her perfect control. She had never shown them the destructive force as she was still scarred by the incident seven years ago and was afraid that people would again start to believe that she was a demon.
All in all, Aria was living a quiet, nice life among kind people. And she was fairly happy.