Here are some ideas about when Sumitra will gets cured completely and what she may want to do with those who tried to kill her.
Instead of having the 3 characters leave the house or give them up to the cops for all the atrocities they put her through, she can tell Shekhar that she wants to punish them in her own special way and no one will interfere with what she has planned for them. She will threaten them with jail time but keep them in the house, the characters won't leave the Haveli.
1. Siddheshwari
She will tell Sid that she doesn't consider her as her bahu anymore and that if she wants to stay in the Haveli, she can stay on, on one condition, she has to stay as her Dasi. She will teach Sid humility. And that if Sid tries to tell her own father anything, Sumitra will call the cops and have Sid arrested for her attempted murder by smothering her with a pillow. That she (Sid) can tell everyone about Ratna's murder and try to implicate Sumitra, Sumitra doesn't care about that anymore. But if she doesn't do what she says, she is willing to tell the cops that Ratna was killed by Sid and that Sumitra was a witness. Laali would always back Sumitra up, as she she literally worships Sumitra as her mother figure.
"Tumne hamri Ratna ko bandook dekar uske jeevan par maut ka mohor laga diya. Hamri jaan leneki kosis ki, Laali aur hamre waaris ko marwaney ki kosis ki baar baar, is khandaan ko jhoot kaha jabke tumre pet mey koi bacha nahin tha. Yehi tumri saza hai, ke Dasi ban kar, yeh gehna goodiya ootarke, saadeh kapro mey jeeyogi.
Jo atyachar Laali par kiye hain tumne, okre liye tum Laali sey mafi mangogi, uske pair chhukar. Uska khoon ganda nahin, tumra khoon ganda hai. Laali ne is khandaan ke liye kya luch nahin kiya, ma bannewali thi, phir bhi hamre liye jail gayi, rasto par bhatki akeli, bhooki pyassi is haalat mein, kabho apna nahin socha, par doosro ki bhalai ki. Hamre Shekhar ki kismat acchi thi ke usko Laali jaisi patni mili..."
Aur Laali ya hamre waris ke kareeb bhi ayi tum, tou ham tumra jeena dusvar kardenge. Tumne Laali ki mahanta nahin dekhi, uska tyaag nahin dekha. Ab Laali hamri bahu hai, tum nahin, aur Shekhar okra pati hai, tumra nahin. Tum apni maang mei Sindoor nahin bharogi, kyuki tum hamri hathyaran bannewali thi. Yeh Sindoor ki haqdaar ab Laali hai. Ab dafa ho jao hamri najaro ke samne se."
2. RanVijay
Sumitra tells RanVijay that when you were first born I thought that you had beautiful little eyes. But I never dreamed that while I fed you my milk and reared you like a precious diamond, you would one day feed me poison on the prompting of strangers. I gave you the gift of life, you gave me the gift of death.
"Hamne tumko apna doodh pilaya, aur tumne hamko jeher. Ham woh din kabho nahin bhule. Hamne tumko jeevan diya, tumne hamko maut. Tumra aur hamra Mai Bete ka rista hamesa ke liye khatam hogaya."
Now, this is my punishment for you. All of the land you currently own and is going to be bequeathed to you, will now belong to Shekhar to do with as he pleases. I will tell Shekhar what to do with that land. Whatever wealth you now possess, you will, will it to your two daughters and wife and keep nothing for yourself.
If you want money, you will have to ask your wife's permission first; it will be up to her whether you get it or not. She will be in full control.
"Agar tumne Nadini ki koi baat nahin mani, ya phir tumne okre oopar ya Riddhya aur Siddhiya par haath uthaya, unko maara, tou mein Darogaji sey keh doongi ke tumne hamko apne haatho se jeher pilaya. Sara jeevan jail mey sar sar ke kato ge. Aur aajke baad, tumre goondeh is Haveli mey kadam nahin kakhenge."
"Uske baad, tum hamre tukro par paloge." You will own nothing, because that is what you have always wanted, craved, and wanted it enough to harass your brother repeatedly, tried to kill innocent Laali over and over, as well as her baby, this house' asli waaris and inheritor.
3. Gangiya
She calls her to her room, with Shekhar present there, and shuts the door. Then she tells her that :
"Tumri saza bhi hai. Tumne hamri jaan leneki kosis ki, hamre bitva ko behkaya, hamey kothariya me bandh kar ke, bhookha pyaasa rakha, baar baar jeher pilane ko majboor kiya hamre bete ko, taki mey jald se jald mar jaoon. Phir tumne hamra gala dabakar hamey mar dalneki kosis ki, uske baad hamko berehmi se seedhiyon par se dhakel diya aur mey lakwe ka sikaar ho gayi."
You have only wanted bad things for my family, the traitor of this family and always been jealous enough to get people killed if you had to. "Tum ek boori aurat ho, aur usse bhi battar, ek boori maa ho. Ma kehlaneke laik nahin ho tum. Apni beti ki ijjat nahin bachai, par Mukul ka maan bachaya, jabke Jamuni ki ijjat Laali ne bachai. Agar tum is Haveli may rehna chhati ho, tou uske badle mey, ham tumse kuccho mangege aur tum naa nahin kahogi."
"Hamey tumse tumri beti Jamuni chahiye, taki tum kabhi uksa faeda nahin othaogi, usey bechogi nahin. Ham uski dekh bhaal karenge aur use paalenge, uska biya karenge ek acche ghar mey. Agar tumne uske saath baat karneki koshish ki, tou ham tumhe jail bhijwaenge aur tum Jamuni se kabhi nahin milpaogi. Hamey tumhari beti dedo." An impossible task, even for Gangiya.
"Apni ajaadi, ya apni beti. Socholo. Chunlo." Gangiya, selfish as ever, agrees to give up Jamuni and stop influencing her daughter.
"Aaj ke baad, tum kabhi Siddheshwari ya RanVijay ke saath koi baat nahin karogi. Agar tumne hamra yeh oosool toda, tou seedhe jail jaogi hamesa ke liye."
More ideas coming soon.