The Opposition parties tore into Pragya, saying what she said reflected the mindset of the people nurtured in RSS ideology.
The body has been sent to the jawan's native village in Bagalkot district of Karnataka.
The letter calls on Bihar CM Nitish Kumar and says that his party symbol-- Arrow -- is a symbol of conflict and violence and that people need a lantern of love and brotherhood.
Rabri Devi has been attacking Narendra Modi regularly in her election meetings and interactions with the media.
Nishant Chaturvedi retweeted a small piece that questioned Rabri Devi's academic skills and mocked at her ability to use Twitter.
Former Bihar CM Rabri Devi sparked a storm on Sunday when she alleged through a video message that the BJP was conspiring to poison her husband and RJD chief Lalu Prasad Yadav.
Tejaswi Yadav, meanwhile, said that Nitish Kumar should clarify whether he had asked Prashant Kishor to visit them.
Rabri Devi told media here that there is no truth in the reports of differences between her two sons Tej Pratap Yadav and Tejashwi Yadav.
Nitish Kumar had in 2017 walked out of the Grand Alliance, which was formed upon his party's partnership with the RJD and the Congress. He re-joined the BJP-led NDA.
Mulayam Singh Yadav on Wednesday backed Prime Minister Narendra Modi for the prime ministerial candidate in the upcoming 2019 Lok Sabha election.
The IT department acted after Rabri Devi and her daughter failed to explain the source of the properties which had been donated to them by RJD chief Lalu Prasad's domestic helps in 2014.
IRCTC scam: Delhi court grants bail to Lalu Prasad Yadav, Rabri Devi and Tejashwi in money laundering case
Special Judge Arun Bhardwaj granted relief to the accused persons on a personal bond of Rs 1 lakh and one surety of like amount each.
The cartoon posted by Yadav, a former health and environment minister in Bihar, depicted Paswan as the mythical demon Mahisasura bearing horns.
Paswan had at a press conference on Friday attacked the opposition Rashtriya Janata Dal (RJD) for opposing the NDA-led government's bill to provide 10 per cent reservation.
Although Paswan had not named anyone while making the controversial comments, his use of the word “anguthachhap” (illiterate) was widely seen as a veiled reference to former Bihar CM Rabri Devi.