Her brothers had a grudge against her. "Girl killed over honour," from the Daily Times (thanks to Twostellas):
LAHORE: A 22-year-old girl was stabbed to death by her two brothers for honour in Baghbanpura on Saturday.
The victim was identified as Shahnaz, daughter of Faqeer Hussain. The police said that Shanaz’s brothers, Babar Hussain and Shaukat Ali, had had a grudge against Shahnaz.
On Saturday, they thrashed her to death. The police registered a case against the accused and sent the body to the city morgue for an autopsy.