In the October 29th episode...Kalindi and Avdoot are discussing about whether its better to break this marriage or not...and Kalindi starts talking about how mother in law is so important in post marital happiness.
At that time she says " Kahi mera atit meri beti ka bhavishya na banjaye".
That means at some point in her life Kalindi has undergone abuse from mother in law.
But Ajju is not like that...
Also in another episode..she mentions to Ajji...that Anjali is reminding her of her previous Sasubai..
"pehlewali Sasubai ki yaad dila rahi hai".
all this points to the fact that Kalindi had another marriage in the flashback...with a bad MIL.
Avdoot is her second marriage...and most likely Astha is not her biological daughter...Astha is Avdoot's daughter...
Notice in the scene where Avdoot is preparing Astha's interview folder, her paperwork.( around 12-13 Sep.) He constantly fumbles to find the papers..the genetic link from him to his daughter is established. At that time the Ajju says..she did not get my qualities...both Avdoot and Ajju discuss which of their qualities Astha has got...but Kalindi does not say anything of what her qualities have come to Astha...
That confirms my doubt that Astha is not biological daughter of Kalindi...there is a past that Kalindi has...which is related to all that is going on with Aastha right now.
Watch those episodes and see for yourself.