The year 2008 with Fashion and Dostana. (Even though she had four other films that year which flopped, these two films catapulted her into the top 5).
She's had more or less a consistent graph ever since with small peaks (like Barfi, Bajirao) and small nadirs (What's your rashee, Zanjeer, etc).
But after Mastani she disappeared off Bollywood so last five years she's been off radar. She should've done Bharat.
LOLLLL
She's had a fluctuating graph. years of flops, then a success period, flops again, success.
But the films that made her a star were dostana and fashion.
After those films, even if she flopped..the audience was still interested in her. thats how much impact those two films had on her career