Rama Chakravarti alias Riya from Uttarakhand's Rudrapur district suffered two bullet injuries. She died on the spot, they said.
The woman was married in 2011 to Jagpravesh Pawar, a resident of Delhi's Jyoti Nagar. In 2015, her husband allegedly committed suicide, SHO of Sahibabad Police Station Jitender Singh said.
She left her seven-year-old daughter with her father-in- law and rented a house here, he said.
Investigations have revealed that the woman worked at a call centre in Noida and the incident occurred when she was seeing off a friend, the SHO said.
The police is scanning CCTV footage. A case has been registered on the basis of a complainant by the woman's father-in-law, the officer said.