Rashmi was Top-2 100% & a contender for winner throughout first half of the show until Arhaan's entry.
SidRa rivalry/khatti meethi nok jhok was what the show was about & why BB13 became a blockbuster.
After Arhaan came, he ruined her chances badly (i even made a post on it back then how Rashmi will not likely win anymore as due to Arhaan she's coming across as very negative).
Then once Arhaan left, she was slowly picking up her game again & was still a sureshot Top-2, & then Arhaan re-enetered again.. then Sallu disclosed about Arhaan's child/marriage/her house being misused etc, all these broke Rashmi down mentally & she was emotionally/physically (her finger fracture) exhausted. I gave her credit for still staying on the show with that mental & emotional state.
She again picked up her game in the last 3-4 weeks of the show, but it was too late by then. Sana & Asim raced ahead of her.. hence she ended 4th. Otherwise Rashmi was either 2nd/winner.