Letwin was born into a family of prominent sculptors in Guruve, married to Obert Nyampipira now and based in Chitungwiza, they now have a little girl.
Letwin is one of the few mid-career women sculptors in Zimbabwe. Following her senior education in Eveline High School in Bulawayo, she embarked on an art related career working as an administrator for Gavazi Gallery in Guruve. On recognising her creative potential she studied stone sculpture under the guidance of her husband and Francis Mugavazi.
Her familiarity with the nature of stone quarried near her homestead and birthplace is apparent in her work. She makes use of innate expressions in the texture and volume of the stone. Her subject matter is figurative and comprises themes which explore the world of African mythology as well as domestic politics and the role of women in society.
She has furthered her studies by participating in Sculpture Workshops in Germany and originally in Zimbabwe with Chapungu Sculpture Park Residency scheme from Dec 95 to 96. She has taken part in numerous exhibitions including the Longmans Womens National exhibition 1993 and the Mobil/Anglo American annual Zimbabwe Heritage 1995 and at ZISO Sculpture Studio (1996). Her works are represented in private collections in USA, Germany, Australia and the Netherlands. She divides her time between creating her own work and teaching women how to sculpt.