Pakistani Islamists are demanding the government leave the country's laws against blasphemy alone.
Thousands rallied in Karachi and other cities Friday to warn government officials any effort to repeal the laws would have serious consequences.
One Pakistani cleric has said if the government fails to go ahead with the hanging, his mosque will offer $6,000 to anyone who kills her.
Convictions under the law are common
Protest leaders are calling for a nationwide strike if the government tries to heed calls from the West to change the blasphemy law.
Pakistan's Christians, who make up less than 5 percent of the country's 175 million people, have long complained of discrimination.
