Rosalind was educated at Adcote School, Shropshire. In her early years she developed a love for architecture. Being the granddaughter of Walter Aubrey Thomas, who designed the Royal Liver Building, Hudson also constructed architectural models. Hudson attempted to further her career in architecture at the Liverpool School of Art, but she eventually dropped out during World War II to join the Women's Royal Naval Service. Hudson was stationed in Bletchley Park and Woburn Abbey for the duration of the war.