Thousands of Palestinians attended the funeral for Riham Dawabsheh, 27, and later about 100 threw rocks at Israeli soldiers nearby who responded with rubber bullets, the military said.
On July 31, assailants hurled firebombs into a bedroom of the family's home in the West Bank village of Duma in a pre-dawn attack, and sprayed graffiti on the walls depicting a Jewish star of David and the word "revenge."
She died in an Israeli hospital early Monday following a recent deterioration in her health. Her 32-year-old husband Saad died of burn wounds last month.
The only family member to survive is the couple's four-year-old son Ahmad, who is still undergoing treatment in an Israeli hospital for severe burns over most of his body.
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A relative, Amjad Dawabsheh, told Israeli Army Radio on Monday that the boy has not been told what happened to his parents and brother.
Palestinian President Mahmoud Abbas declared three days of mourning and ordered flags lowered to half-mast, his spokesman Nabil Abu Rdeneh said.
"If Israel is not stopped and held accountable, then Riham will not be the last victim of Israeli terror," said Saeb Erekat, a top aide to Abbas, in a statement.
The attack, believed to have been committed by Jewish extremists, shocked Israelis and was widely condemned across the political spectrum.
Israeli Prime Minister Benjamin Netanyahu issued a statement today expressing his condolences and saying "security forces are doing their utmost to apprehend the assailants and bring them to justice.