"It is against constitution of our country. A Prime Minister or chief minister candidate is chosen respectively by elected Members of Parliament (MPs) or Members of Legislative Assembly (MLAs). I do not find it right," Shukla said.
It is against the laid down principles of the Constitution, she said.
She also claimed that Modi, who is campaigning aggressively in assembly elections, will have no impact on the poll results in Chhattisgarh, Madhya Pradesh, Rajasthan, Mizoram and Delhi.
"States have there own problems and profiles. National problems are different from states. In states, workers have formed their own strategy to ensure victory. Modi will not have any effect in the election," said Shukla, a former national president of BJP Mahila Morcha.
Shukla, also a former MP from Jangir-Champa parliamentary constituency, had last month quit the party over differences in BJP's style of functioning in poll-bound Chhattisgarh.
"I do politics based on values and principles, the same way I live my life. Self-esteem is very important. For last five years, certain things were going on in BJP which I did not like.
For which I decided to leave the party. I feel BJP does not need me," she said.
She said she approached senior leaders on the situation in the state BJP but it did not help.
"Later, I thought it was best for me to leave the party," Shukla said.
Though, the former BJP leader claimed she has been approached by many for campaigning against BJP but she has decided not to speak in favour or against any political party.
"I am without any party.I am independent. I have been approached by many opposition parties to join or campaign against BJP. But I refused. Who does not need a ready made 'neta' with 32 years of experience?
"I have decided not to campaign in favour or against anybody," Shukla added.
The rebel has influence among sizeable number of voters in Janjgir-Champa, Korba and Bilaspur constituencies.
She said Vajpayee has always been a guiding force and source of encouragement for her and other party workers.
"Vajpayee ji's blessings are with each and every worker of BJP. I too had his blessings. But I never did politics in area which had his influence like Vidisha and Gwalior (in Madhya Pradesh) and Agra (in Uttar Pradesh) among others," she said over phone from Raipur.
Shukla declined to comment when asked about probable outcome of the elections.
"I will not like to say anything on this," she said when asked whether BJP would win the elections.
Shukla, who had contested 2009 Lok Sabha polls from Korba constituency, had lost the election to Congress' Charan Das Mahant.
Mahant was the lone Congress MP in Chhattisgarh, which has 11 Parliamentary constituencies.
As many as 72 assembly constituencies of Chhattisgarh are slated to go to polls in the second and final phase on November 19.