She has been living a lie for so many months someday or other lie will be caught.
So where is the question of Sanchi's win?
That's how liars get exposed. They slip up.You can fool people for some time but you can't fool all the people all the times.
What did she win in the end?She thought she fooled everybody but she made a fool of herself in the end for thinking her drama won't come out.
Her drama may have been discovered by Jagya and Anandi but she will go on till she slips up in front of her family too.
In the end it is her and her mother who are going to pay the price.