Why do I feel dot died ?
That's the reason riddhima is behaving strongly and weirdly (Because she is in trauma and depression) !!
Then all the chaos happened , she has only vansh in her life . So , she is trying to save him aggressively .
Warna woh har kaam darti hui or roti hui karti hai aur bapaa ko toh pal pal khabar deti rehti hai madad pooch thi rehti hai .
Some heartbreaking things took place with riddhima in those 6-7 hours in that ,one of them is "dot is dead"
She is definitely riddhima and she through something during that period .
She might be staking everything to save vansh from danger and she is behaving in a certain way because she in some trauma after child's death or purposefully.