Siefken provides pro bono legal services to homeless clients at the Harry Tompson Center two days a week and bimonthly to senior citizens at the St. Bernard Council on Aging. Siefken also works as a volunteer research attorney for the Independent Police Monitor preparing reports on NOPD policies and practices. She has dedicated many volunteer hours with Catholic Charities, assisting the staff attorneys at Project SAVE and providing disaster relief services to the Plaquemines parish community in the aftermath of the 2010 BP oil spill. She also enjoys volunteering with organizations such as WRBH Reading Radio, New Orleans Outreach, and Second Harvest Food Bank.