She will be sad, no doubt, and their thinking is so much more complex at that age so she will probably dwell on it and even TRY to dwell on it. Distract her the best that you can, doing super fun preschooler activities and she should come around within 2 weeks. I did have an almost 5 yrs old girl that never did transition in though...she cried all day every day, and while I was empathetic and supportive it did get on my nerves big time because I felt she was too old for this ongoing behaviour. I terminated after 2 months of incessant crying and moping around Hopefully, this isn't the case for you!