A 23-year-old woman died after allegedly jumping from the balcony of a 10th-floor flat in Jaypee Kosmos society in Sector 134 following an argument over her birthday cake on Tuesday. The woman was preparing to take admission in a master’s course for hotel management, police said. Her elder sister and brother-in-law stay in the flat where the incident took place, while the woman, her parents and brother stay in a flat in another tower of the same society. They all arrived at the elder sister’s flat around 2pm for celebrating the woman’s birthday on Tuesday.