Just before New Year's 1904, Warne sent Potter a glass-fronted mouse house with a ladder to an upstairs nesting loft built to her specifications so she could easily observe and draw the mice. The doll's house Potter used as a model was one Warne had built in his basement workshop as a Christmas gift for his four-year-old niece Winifred Warne. Potter had seen the house under construction and wanted to sketch it, but the house had been moved just before Christmas to Fruing Warne's home south of London in Surbiton. Norman Warne invited Potter to have lunch in Surbiton and sketch the doll's house, but Mrs. Potter intervened. She had taken alarm at the growing intimacy between her daughter and Warne; as a consequence, she made the family carriage unavailable to her daughter, and refused to chaperone her to the home of those she considered her social inferiors. Potter declined the invitation and berated herself for not standing up to her mother. She became concerned that the whole project could be compromised.