Looking at the promos, many expected that Himaja has really got that broke-down moment as she turned quite violent with her behaviour. And as the Season 3 Episode 34 got progressed, it is revealed that she actually behaved this way as part of the secret task.
Himaja is given the task of becoming the villain of the house and destroying the food items in the kitchen. Later she needs to spoil the luxury budget task as well such that housemates will suffer. While Himaja succeeded in breaking the eggs thereby winning wrath of the house, and then successfully stolen makeup kit of Vithika and protein powder of Ali Reza, she failed to do the luxury budget disruption thing.
As housemates got a clue that Himaja is up to a thing, they have prevented her from disrupting the luxury budget task as they kept her off at a distance by preventing her to come near. As Punarnavi, Sreemukhi and Ali Reza spoke about the videos they were shown and Himaja spoking nothing such, they have easily discovered that she’s up to something.
Successful completion of the task would have gained her immunity from getting evicted, but as she failed, her fate now depends on people’s votes.