A quality water bottle is the sort of gift that works perfectly when you barely know someone. It is genuinely useful, appropriate for any office environment and says nothing presumptuous about her life outside work. A stainless steel version keeps drinks at the right temperature and looks professional without trying too hard. She will use it daily without it ever becoming a talking point and there is genuine comfort in that. This is the gift that solves the problem of needing something thoughtful but not personal.