Much of Aumann's career has been focused on accounting. She was a sales associate at Valley Motors, a car dealership in
Cockeysville from 1983 until 1985, when she became a loan counselor with First Financial Federal Credit Union, in nearby
Lutherville, where she worked for a year. Soon thereafter, she worked as a private banking account executive for the Bank of Baltimore, working there from 1987 until 1988. In 1988, she took a position as a staff accountant for Ira J. Sugar & Associates, where she worked until 1989. In 1989, Aumann began working for MNC Financial, which was bought by
NationsBank, where she stayed for several years. She later worked for Congressman
Bob Ehrlich, first as a Financial Operations Officer and Treasurer, then as Finance Operations Officer and Treasurer for his "Bob Ehrlich for Maryland Committee" where she stayed until 2002. Aumann was a member of the Baltimore County Republican Central Committee from 1994 until 1998 and the North Central Republican Club from 1990 until 1999. Other groups where she is a member include the Loch Raven Watershed Coalition, Shepherd's Knoll Condominium Association, the Historic Hampton, Inc. in
Towson, Maryland and the Women's Committee of Hampton. As a member of the
Maryland House of Delegates, she was a member of the Appropriations Committee, the Joint Audit Committee, the Joint Committee on the Management of Public Funds, the Special Joint Committee on Pensions, and the Joint Committee on Legislative Ethics. From 2007, she was a Deputy Minority Whip. ==Family==