The mother is still not well. Her mental state hasn’t improved at all. They thought she got better when Hari came into the picture but we’re shown that clearly isn’t the case. Poor woman, heartbreaking that she couldn’t cope with the loss of her baby girl and was unwilling to accept it, that ultimately her denial and depression caused her mental instability...
Sad that she doesn’t see Hari for herself, but as a substitute or replacement for her deceased daughter. That is why she dresses her up in clothes similar to Alina and also the reason why she’s giving Hari the same type of strong drug that she gave to her daughter to alleviate her pain, but that can be harmful to Hari because doesn’t need it...
She needs serious help but her husband is not taking her mental illness seriously enough because he wants to pretend that everything’s back to normal, it seems he’d rather turn a blind eye and put all the heavy burden on his eldest son for his wife’s sake. Tragic.