Just wondering

i dont get star+ here but been watching bits and pieces of this show on utsaav, one thing i cant figure out is why is this amma (krishna and shakti's) 😕😕 so mean to her bahus???? was she mistreated by her saas when she first got merried ???? and she is taking revenge??? and that daadi why is she always ringing bells, is she mute?? or keeping quite by choice, 😆(dont blame her for that what stupid family she has)😆