I think it's been implied she was drugged or something? I at least wouldnt put it past the 'compatriots'... or maybe it's postpartum. mc is less than three years, I doubt the mom got any help after the birth considering both the time this story is in and the fact that most of her servants were actively scheming to steal her child... but idk, maybe she knew and just didnt care, it's too early to tell *shrug*

Her mother is fucking weird
She’s like an emotionless doll
Even knowing you gave birth to another child she show no reaction at all