Deepshikha went out because:
1. She was being extremely petty and at the level of being cruel towards Gautam, which was digusting to viewers and (i think) BB. Probably Salman didnt like her disgusting behaviour towards all housemates expect her group (karishma, soni and diandra, upen and arya).
2. She became self - appointed captain of the house like Salman pointed, which was extremely annoying to see how she was hogging all the limelight.eg- "Upen sorry babu tying the chain on ice for Arya is my job." To Arya - "Mujhe khana banane mein under se khushi milti hai"(we all know why you are in the kitchen lady!!!😆)
3. She was present in all the fights making it bigger than necessary and then fake cried to gain sympathy. She got sympathy from her group but not from audience. Audience knew she is a big drama queen.
4. It was so irritating to see her hogging all the limelight with Hritik and Rekha, she wouldnt let anyone come near them. Probably BB thought lets kick her out so other people can get some chance to give their opinion/shine with the guests. She was speaking for other people alot and hence hiding others' potential.
5. She didnt look nice on camera, she was sore on the eyes. I can never forget her horrific expressions after Hritik left and she was talking to Upen and Karishma & said Gautam was hogging footage. She showed how small-hearted and evil person she is.
6. She was trying to pacify both fighting parties, hence getting into good books of all housemates(in her mind) and defuse the fight/confrontation so no masala for BB or screen time for fighting parties. So all gain for her and no gain for BB or other contestants.😆
7. Last point: (i think) Everyone outside hated her for being an evil b*tch lol😆