Initially, al-Rishawi said in a televised confession that her own belt failed to detonate and she fled, but she later told her trial that she was an unwilling participant in the attacks and never tried to set off her bomb.
Al-Rishawi was one of seven defendants in the case.
'Destruction and death'
The other six remain at large and were tried in absentia last year in Jordan's military court.
Like al-Rishawi, the six were sentenced to death by hanging last September. Al-Rishawi appealed against her sentence immediately.
But Jordan's appeals court said it "ratified" the military court's death sentence because al-Rishawi was "guilty beyond doubt of possessing explosives and having had the intention and the will to carry out terrorist attacks whose outcome is destruction and death".
The appeals court's decision is final, but it can be overturned by King Abdullah II, the ultimate authority in Jordan.
Jordan executes by hanging. An average of 10 people - mostly men - are executed each year for crimes that include terrorism and premeditated murder.