Kyunki Saas Bhi Kabhi Bahu Thi - betrayal by the bahu

A battle royal between Tulsi and Tripti is ongoing, with Tulsi fighting a proxy battle with Vaidehi (her bahu, but one who also totally believes in Tripti and is fighting to destroy the Viranis even though she is married to Laksh and is now in love with him). One wonders as to how Tripti is wandering around free and out of jail, given that she had been sentenced by a court to a jail term, but she is wandering freely without any constraint; but she must have proved a popular villain, and hence they brought her back into the serial in a confrontational mode with the Viranis without worrying about a jail sentence.
So Vaidehi sets out on her task. It can be a good role for any actress, showing her to be a dutiful daughter-in-law while also seeking to destroy the family in which she lives. In this case however, by getting her to confront Tulsi at every opportunity, to laugh like a maniac many times, and to try to look evil a lot, somehow is ruining the whole effect. It looks out of place, and seems like over-acting. At the same time, they show her to be capable of any kind of wrong deed, including adding stuff in juice and putting oil on steps to make people fall.
The interesting part is, Tulsi knows about what Vaidehi is trying to do (she saw her with Tripti and heard her conversation), and has confronted her on a number of occasions, but has been unable to reform her. At the same time, she is unwilling to reveal her secret to the rest of the household since she is trying to reform her with love. And after KT cursed Vaidehi that her marriage would also turn bad after Vaidehi had caused the break-up of KT and Eklavya, it is pretty clear what the future will bring. Vaidehi will start to get swayed by the love she is receiving from the family and Laksh, and in the meantime, Laksh will find out her secret.