DySP of CBI A K Jha confirmed that Soren's property had been attached.
The apex court while hearing the bail petition of another accused R K Agarwal in the case had on February 14 asked CBI whether it could not arrest her.
Agarwal, an industrialist in judicial custody in connection with the case, was in the fray as an independent in the scrapped RS poll of March 30, 2012. He had surrendered to a special court here last year.
The EC held the polls afresh on May 3 that year.
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Sita Soren, who is the widow of JMM chief Sibu Soren's son Durga, is an accused in the case along with her father B N Majhi and her private secretary Rajendra Mandal.
She has been evading arrest in the case but had managed to reach the state assembly and cast her vote in the trust vote moved by Jharkhand Chief Minister Hemant Soren on July 18 last year.
On February 14 a special CBI court here had framed charges against Agarwal and industrialist Pawan Dhoot, who too had filed his nominations for the 2012 RS polls.
CBI is also investigating the 2010 RS elections in Jharkhand following allegations of horse trading.