>>103676171
If she didn't want to leave her mother, she wouldn't have spent almost 6 months in Japan this year, but would have acted like Shiori.
Aradia told what her mother was sick with and that there was nothing she could do about it.
Nerissa already hinted last year that she wanted to move out from her parents and live alone, but she still hasn't made up her mind, she could also rent a place near her parents if she's so worried.