Blattman began her Northside career in 1974 as a teacher at Oak Hills Terrace Elementary School. After serving as the District's first Gifted and Talented Coordinator from 1983-84, Blattman was appointed Principal of Sunset Hills Elementary School (now Glass Elementary) and Colonies North Elementary School. In 1992, she moved to administration, serving as Executive Director for Elementary Administration, then Assistant Superintendent for Elementary Administration, and finally Deputy Superintendent of Instruction. Personal accolades include the Teacher of the Year Award by the Northside Independent Teachers Association, and the Northside Distinguished Achievement Award for Student Relations.
She retired at the end of the 2002 school year after a distinguished 34-year career in education, including 28 years at Northside. During her tenure as NISD's instructional leader, the District became the largest Recognized District in Texas, had major increases in the number of Recognized and Exemplary schools, and seven National Blue Ribbon Schools.
Major improvements that occurred under Blattman's leadership included the implementation of academic performance standards, the dual language immersion program, increased credit-taking opportunities for high school students, major expansion of the instructional technology program, and significant improvements in the Career and Technology Education program.
Blattman continues to remain active in the Northside community as a leader of the NISD School Museum Association.