well i just started watchin it recently only, will try my best to help u...... don't know when she entered... she is Parvathy's daughter and she is very close to her parents. and then it was revealed tht actually she is not Parvathy's daughter but Parvathy's best friend's daughter, and she got exchanged when she was small. ad parvathy's real daughter was Gayathri.
Shruti was first married to some1, but then after tht marriage broke, she falls in love with Samar, but then Gayathri also falls in love with him, and she has a baby boy(Chotu) from him, and later Shruthi marries him. But due to some reasons Gayathri kidnaps Shruthi and she meets with an accident and she finds out tht, if she gets pregnant then it wud be dangerous to her. So Gayathri feels guilty and leaves Chotu with her and goes.
Then Om gets killed, and Parvathy thinks tht Suyesh Mehra killed him, and decides to take revenge and marries him, and she tries to ruin his business, and she makes Gunn work in the company inorder to ruin his business, but when Shruthi finds out abt Gunn, she complains to Parvathy, but since Gunn was working according to Parvathy's instructions, Parvathy sides with Gunn, which makes Shruthi against Gunn, and eventually Parvathy as she thinks tht since she is not their real daughter, Parvathy loves Gunn more.
Meanwhile Gayathri comes back and kidnaps Chotu, when Samarfinds out he gets pissed, and in the end Shruthi decides to risk her life and have a baby. So Shruthi, Gunn and Sonu gets pregnant at the same time. And Samar wants a baby boy, while Sonu doesn't want a baby.
And Parvathy proves tht Suyesh killed Om and puts him in jail, and Shruthi, Gunn and Sonu gives birth on the same day, and only Parvathy was in the hospital while every1 else had gone to a temple.
Shruthi have a girl(Tanu), Sonu a boy(Pranay) and Gunn loses her baby. Since Sonu didn't want a baby she decides to give her baby to Gunn, but then Gunn and Shruthi exchanges the baby, and the three of them promises not to tell every1 abt their baby swapping.
Later Krishna has doubts on the parentage of Tanu, and gets a DNA report which says tht he is not Tanu's father, and he questions Gunn abt it, and later Parvathy tells Shruthi to tell Krishna the truth, and Shruthi refuses as she doesn't want to jeopardies her marriage. This creates a bigger rift between Parvathy and Shruthi, as Shruthi again accuses her of loving Gunn more than Shruthi.
Later it is revealed tht Suyesh is not the one who killed Om, it was his wife and Trishna(Kamal's wife), and Krishna finds out abt it, before he cud tell Parvathy abt it, he gets killed, and he falls into a river(body not recovered).Later Trishna and Rajeshawari makes proof tht it was actually Parvathy who killed Om and Krishna and except for Kamal and Gunn every1 believes Trishna. Shruthi also testifies against Parvathy in court. Parvathy is then send to jail, but she fakes her death with Narayani Devi's help and escapes and 18 yrs later she returns as Janaki to take revenge.
Now Shruthi knows tht Parvathy is Janaki, and she is trying to prove it as she still thinks tht Parvathy killed Om and Krishna, but Janaki always manage to foil all her plans, and she keeps blackmailing her abt telling every1 abt the baby swapping. She brings Rajeshwari to her house.
Pranay wants to become a writer, while Trishna and Samar wants him to join the family business, and so she pays the media to give negative publicity for his first book, and Parvathy finds out abt it and gives Pranay another chanceto write a book, and she then transfer 500crore worth property on Pranay's name, but Pranay refuse to join family business and wants to become a writer while Shruthi now wants him to join the family business, now even Samar supports Pranay. One publisher tells Pranay tht it was Shruthi who paid media to write badly abt his book, and Pranay gets pissed and breaks off all relations with Shruthi, when Shruthi calls up the publisher he tells her tht he was paid to say so by Rajeshwari, and Shruthi throws Rajeshwari out of the house.
i hope this helped....this is just the shruthi part of kggk.