first, she took a bullet which was to hit Alekh
Then, she jumped into the fire to save Vasu...
She was about to eat the food having poison, when Ragini saved her...
These r instances that death was telling her, that death is approaching, We saw lots of trailors where probably the creatives were giving hints that Sadhna might die? No one has encountered any death sequence like Sdahna in the show...