Sanchez was a senior legislative assistant to Bachmann, a Minnesota Republican. Her office is in the Rayburn office building, where police say the thefts took place.
Sanchez has been charged with theft of money or goods less than $1,000 in value.
Bachmann spokesman Dan Kotman says Sanchez was no longer with the office as of Friday.
A favorite of the tea party movement, Bachmann ran unsuccessfully for the GOP presidential nomination in 2012. She recently announced she will not be seeking another term in the House.
Copyright 2013 The Associated Press.
Photo: Rep. Michele Bachmann, R-Minn., arrives with staff member Javier Sanchez, right, for a closed all-member briefing on the NSA on Capitol Hill in Washington, Tuesday, June 11, 2013.