Zia, 72, was sentenced to five years in jail by a Dhaka court on February 8 on charges of corruption involving an orphanage named after her slain husband and military ruler Ziaur Rahman.
"What we could do if they want to abstain from the elections...the court has awarded her the imprisonment, we did not and (so) we cant withdraw it either, Hasina told reporters.
The trial ran for long 10 years when she (she) exhausted all options to upset the process through filing over 80 writ petitions, getting the trial judges changed thrice expressing no confidence (on their neutrality) and got the hearing deferred for 109 times in the name of hearing preparedness, Hasina said.
The premier said the chief of the past interim government Fakhruddin Ahmed was a trusted bureaucrat of Zia.
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Yet she was convicted of graft for embezzling money... such a crime draws punitive actions both from divinity and mundane court, Hasina said.
Zia, however, appears to be seeking to contest the next polls set for December this year.
Analysts feel that the BNP is now in a political wilderness after Zia's conviction, which is likely to disqualify her from contesting elections.
BNPs secretary general Mirza Falhrul islam Alamgir earlier this week told a protest rally that the party would not take part in polls without Zia.