Authorities say foul play does not appear to be a factor in her death.
44-year-old Teresa Mastracola has been missing since last Sunday.
She was last seen leaving her home between 9:00 and 10:00 a.m. wearing scrubs and getting into her 2006 Mazda sedan.
Police say she drives a silver 2006 Mazda 6 4-door sedan with a black bicycle rack and Pennsylvania license plates DTA-5563.
At first, Millbourne police were reluctant to call the woman's disappearance suspicious because she is an avid hiker who often left town for days at a time.
Mastracola works as an Imaging Equipment Specialist at Delaware County Memorial Hospital. Her coworkers started to get nervous this week when she did not show up for work.
Action News has also learned that the woman holds the rank of Master Sergeant with the National Guard.
Investigators from the Delaware County Criminal Investigation division, PA State Police and Millbourne police are all working the case.
Anyone with information regarding the location of her vehicle is asked to call Millbourne Police at 610-352-1450.
