Paschalinelily
I think the mother is suppse to be a little crazy annoying and unreasonable here. It shows the broken home dynamics and overbearing bossy home that female lead comes from. that way she is very independent and does not trust her heart to others and is always watching the person with power in front of her ready to react to defend and pacify their stormy anger like she did her mothers angry 0730 outburst into her room. This is how she had to live as a child who had no power, so she cant just "grow up" and stop being like this suddenly. It seems she did learn to keep things to herself and solve her own problems relying on only her lonely self.