It was early on the 1st of November 1981 when mister Weasley got up, even earlier than usual. His wife was already up, probably in the kitchen or taking care of their little farm. However, when he got into the kitchen, he could ear noises. There was the voice of Dumbledore and the other one belonged to his wife. In the kitchen he found his wife, in the company of Dumbledore and a little girl sleeping in Dumbledore's arms. The child seemed to be no older than five years old, her hair was the same color as the Weasley's, but her skin was nearly white. He needn't be told who she was for he already knew it even though he had never seen her before and he needn't be told what had happened. The child was the daughter of Lily Potter née Evans and an unknown father. She was there because her mother was dead. A few weeks earlier, when it had become clear that Lord Voldemort was after the Potter family, his wife and him had accepted to take the child in in the off chance that she survived an attack on her family. The fact that she was here with Dumbledore meant that Voldemort had killed the Potter.
"Arthur!" Shouted his wife, knowing he was in the staircase, "Professor Dumbledore is here."
"I know Molly, I just saw him"
"Oh."
"It's over then?" Asked mister Weasley to the professor. "He won?"
"Voldemort did not win. He was destroyed. He killed James and Lily Potter, but when he went to kill their son, he did not succeed and was destroyed."
"What about the girl?"
"I am not certain. However I am sure that she was not hurt in any physical way."
"Does she know what happened?"
"I believe she saw a part of it, but when we found her, she was already asleep. She seemed to have been hiding in a closet in her brother's bedroom when Voldemort came in and killed the Potter."
"As we had already discussed, I brought her here as soon as she was found. Here are her papers. Her name is Frederica Primula Weasley. She is from Western Europe where her parents were killed by death eaters a few weeks ago and it took all that time to find her nearest living relatives because of the war. She is five years old and was born on the 19th of April 1976."
"Here are some potions prepared by Madam Pomfrey," continued the Professor, "the brown one is for the stress and the purple one is to help her sleep if she has problem with nightmares or if she just cannot sleep."
As Arthur was sitting at the kitchen table, offering breakfast to his guest, the little girl started to wake up.
"Where am I, asked the child."
"You are at your new house." Answered Molly.
"Who are you?"
"I am Molly Weasley and this is my husband, Arthur. Are you hungry?"
For a few seconds, the child did not say anything.
"Are mom and James dead?"
"Yes." Answered the professor. "Do you know what happened?"
"No." Answered the child after a few seconds.
"Can you tell me your name?"
After carefully thinking, the child finally answered, panicked: "I don't remember my name!"
"It's all right dear." Said the professor in a smooth, calming voice. "You have been through a lot in the last few weeks. Your name is Frederica Primula Weasley."
In the weeks following the arrival of Frederica at the Weasley's house, Molly and Arthur had gotten attached to the little girl, has had all of their children, especially Percy, who was her age. At one point, the child stopped calling Molly, Arthur and their children by their first names and called them 'mother', 'father' and 'brother' and 'sister'. She even seemed to be a good thing in the life of the Weasley children, especially Charlie, who was four years older than her, but who had started to feel very protective of her the second he saw her. The little girl, eager to know her new environment, went everywhere and, since Charlie was the oldest kid at home, he was the one tasked with looking after her and Percy, who would not go anywhere without her. After a few months, they also discovered that the little girl was fascinated with animals, especially hippogriffs, as she seemed to know more than Charlie and Bill about them.
The little girl had had a bit of trouble adjusting to being called 'Rica', has one of the Weasley's son was already named 'Fred'. She also had trouble sleeping and almost always had nightmares involving a green light and what she called 'the cloaked monster', but has she grew older, she stopped having those nightmares and was able to share a room, first with Percy and the twins, then with Ron and Ginny and, latter, only with Ginny. The last time Rica had that nightmare was when she was eight years old.