Meena Rai said that she had been shopping with the unnamed victim for wedding outfits and the contents of a wedding box known as trousseau.
"They had made all the wedding preparations and had planned a wedding party in Delhi," she said.
Usha Rai (no relation), who was also present for the cremation ceremony, confirmed that the woman had planned to marry in a matter of weeks.
"We know that she was going to get married in February," she said. "The whole neighbourhood was excited about it."
The boyfriend also suffered serious injuries during a prolonged assault on a bus on the night of December 16 after they had spent the evening watching a movie at a multiplex in the Saket.
He has not spoken since the attack which reports said began when he defended his girlfriend after she was initially verbally abused by a group of six men.