A 60-year-old Lynn woman pushing a baby inside a stroller died after a vehicle backed into her in a store parking lot Sunday afternoon, police said. The baby was not injured but was taken to North Shore Medical Center in Salem for observation as a precaution, according to Lynn police Lieutenant David Brown. The identities of the woman and the driver were not released. The collision happened at about 5:30 p.m. in the parking lot outside of the Riverside Market at 826 Boston St. near the Lynn-Saugus line, Brown said. As of Sunday night, no arrests been made or citations issued. Authorities continued to investigate, he said.Matt Rocheleau can be reached at email@example.com. Follow him on Twitter @mrochele.