Replying...
Intro. Miku (the one with blue hair) and Sarah (the one with green hair), are mother and daughter, Miku is the mother and Sarah is her 15-year-old daughter. When Sarah was 8 years old, her father, Miku's husband, died in an accident, Miku was devastated, as was Sarah, but Miku spent days crying, refusing to leave the house, she barely ate. Sarah felt very bad seeing her mother like this Due to the accident they were left with almost nothing, after the day of the accident, they were left without a home, without a car, without their things, they had to stay in a small apartment, Sarah had to take care of her mother, since Miku was locked up and destroyed for 2 years, she did not go out, But in the 3rd year Miku recovered, she was already leaving the apartment, but that is not the strange thing, in that year, she smiled again, she was happy, she returned to how she was before, and when Sarah saw her, she was confused and missed

Mother acting weird

@Percibal