The printed wrapping paper on Dorothy's gift was not invented until 1917.
This episode occurs in early February since it is in preparation for Valentine's Day. The town is Colorado Springs, Colorado. There is no snow on the ground and there is green fields and leaves on the trees. It is apparent that they are not filming at a location similar to Colorado Springs.
Dr. Quinn was born on February 15th. Her birthday would be more important and romantic than Valentine's Day.