Who is Najamai from Swimming Lessons and what is their importance?

In "One Sunday," Najamai is introduced as a hefty 55-year-old widow whose husband Soli dies a year after daughters Dolly and Vera go abroad to continue their education. Three years ago, she has fat removed from her abdomen and breasts as a precaution against sagging when she turns 60. She has the only refrigerator in the C Block, which she rather grudgingly allows next-door neighbor Tehmina and downstairs neighbor Siloo Boyce to use. She gives vagrant handyman Francis leftovers and jobs, but when she finds him lurking in her dark kitchen after visiting family in Bandra, she raises a cry that gets Francis hunted down and manhandled.