Prior to her election in the upper chamber in 1984, she served six terms in the Missouri House of Representatives. She was re-elected to the Senate in 1988 and 1992, representing the 1st Senatorial District, which serves a portion of St. Louis County.
The senator also is a member of the Missouri Tourism Commission, the Joint Committee on Legislative Research, the Joint Committee on Economic Development Policy and Planning, the Joint Committee on Public Employee Retirement, the Governor's Advisory Council on Productivity, the Missouri Job Training Joint Legislative Oversight Committee, and the Video Advisory Committee.
Under provisions of the measure, new stadiums and auditoriums are required to have an equal number of toilets in restrooms for women and men. The bill also applies to buildings in which more than 50 percent of the area is undergoing renovation.
In addition, facilities providing diaper-changing stations for infants must provide them in equal number in restrooms for men as well as women.
Treppler also sponsored a bill that makes minor changes in the Missouri Seismic Safety Commission and extends until June 30, 1997, the deadline for the commission's report on the implementation of an earthquake hazards reduction program.
In addition, Sen. Treppler sponsored legislation repealing a law that establishes specific fees for copies of documents from the Missouri Public Service Commission. The new statute permits the PSC to establish such fees by rule in compliance with general state laws regarding fees for copying public records.
Sen. Treppler handled in the Senate a House bill on parental preference in state hiring that carried the same provisions of a Senate measure that she sponsored. Treppler won Senate passage of the House bill.
Under the terms of the bill, five points are added to the employment examination of a former state employee applying for a merit system job who quit work to care for a child under the age of 10.
She won approval of an amendment that saved the Bayless School District a large amount of money. The amendment, which was to a bill on school levies, carried a one-time provision allowing the Bayless School District to keep state money it would have lost because of failure to pass a school levy of $2.75. Involved was a sum totaling $500,000 to $600,000.
Another education measure sponsored by the senator involved revision of the video sales tax law to provide for a more exact accounting of the amount of revenue collected. Revenue from the sales tax is deposited in a video educational fund used by Missouri public school districts and state-operated higher education institutions.
Sen. Treppler also sponsored and won approval of a bill requiring the placement of an identification tag on the body of a dead person or in the casket or urn containing cremated remains. The bill was necessitated by the 1993 flood disaster at the Hardin Cemetery in Ray County. The flood washed away 769 coffins holding bodies.
Another of her successful measures clarified language regarding continuation of fire protection district service and the collection of taxes in areas incorporated because of Boundary Commission action in St. Louis County.
Another piece of Sen. Treppler's 1992 legislation requires the Missouri Highway Patrol to have other law enforcement agencies report all incidents of domestic violence whether an arrest was made or not.
Another measure in 1991 was a resolution sponsored by Sen. Treppler allowing cities, counties and school districts to sell bonds to finance the renovation of buildings to withstand earthquakes. This consitutional amendment required approval by voters but because of an anti-tax sentiment prevailing among Missouri voters the measure was defeated at the polls. If passed, the legislation would have resulted in safer public buildings.
The bill requires school districts near the New Madrid Fault to establish earthquake emergency preparation plans and to distribute earthquake safety publications to students. It also requires cities and counties to adopt ordinances requiring new buildings to meet earthquake safety codes.
Another of the senator's bills expanded the school bus safety law passed in 1986. The updated measure covered smaller districts that declined to follow the standards set forth in the original law. Her 1987 bill requires bus drivers in these smaller school districts to be at least 18 years old and to have a valid chauffer's license.
The senator also co-sponsored a bill to require all motorists to carry automobile liability insurance. The law allows the police to check drivers involved in accidents or traffic violations to make sure they have the required insurance. It also contains penalties for people who refuse to purchase the insurance, including fines and the possible loss of their drivers' licenses.
She received the 1992 Missouri Chamber of Commerce's "Spirit of Enterprise Award," given in recognition and appreciation of her "efforts to protect our nation's free enterprise system." She has also received the Missouri State Medical Association Award of Appreciation for her continuing efforts to improve medical care for the citizens of Missouri. She received the 1993 national Otto Nuttli Earthquake Hazard Mitigation Award, and most recently the Distinguished Legislator Award - Community Colleges of Missouri, 1995.