Creator Gladys Parker modeled Mopsy after herself, she was a pert, tousle-haired brunette. The strip's story lines dealt with Mopsy's daily activities. During WWII Mopsy worked as a nurse, a munitions-plant worker, and other jobs women typically had during the war, and this was a very popular strip during that time. When the war ended Mopsy went back to civilian life, but she continued to maintain her popularity until 1965 when the strip ended. Gladys Parker passed away the following year." quote thanks to Samuels Designs at http://www.samuelsdesign.com/comics/pages/goodgirl-romance/mopsy1.htm
There are date gaps as follows: #13 (November 1950); #14 (Sept. 1952); #15 to #19 (January, March, May, July and September 1953).
See also: Pageant of Comics (St. John, 1947 series) #1 first appearance of Mopsy in a comic and TV Teens (Charlton, 1954 series) #7 to #13, Mopsy reprints with some new covers.