The 28-year-old Parveen Bano was washing cloths near the wall when it caved-in early in the morning, investigating officer Prabhu Dayal said.
According to her family, a day after a medium-intensity earthquake measuring 4.4 on the Richter Scale hit Rajasthan, the wall at Bano's house on Piprali road here had developed cracks, he said.
But the matter is under investigation, Dayal added.
The tremor which shook the north-western state of India last night had its epicentre at Sikar, according to National Seismological Centre, a unit of Ministry of Earth Sciences.