In February of 1999, Betsy brought Mother Goose on the Loose to the Enoch Pratt Free Library in Baltimore, Maryland. The first sessions took place at the Exploration Center, a public library inside of the Port Discovery Children's Museum. Held in a small area between book shelves and computer stations, the program become so popular that it expanded to four MGOL sessions each week. As the demand for the program grew, other Pratt librarians were trained. In addition to being offered four times a week at the Exploration Center, other Pratt libraries also began running Mother Goose on the Loose sessions.

In the late 1990s, many public libraries began to take notice of scientific research suggesting that the majority of brain development takes place in the first years of life. Many children's library programs at that time were geared for preschoolers from ages 3-5; baby programs were not yet the norm. The research findings led to available funding for baby programs, but as librarians became interested in offering programs for babies from birth to age three, they realized that there were not many models to follow. As a result of the interest in Mother Goose on the Loose, Betsy was invited to give a presentation at the annual "Kids are Customers, Too" workshop sponsored by the Children's Services Division of the Maryland Library Association.

After hearing about this successful, time-tested program, librarians throughout Maryland came to Baltimore to observe sessions, requested information, and booked training workshops. The publication of two articles about Mother Goose on the Loose in peer-reviewed magazines for librarians was followed by requests for training workshops from library systems around the country.