The Winter Park police said a credit card, social security card and driver's license were stolen from a 92-year-old resident's purse at the Winter Park Towers assisted living facility.
The cards were later used in various places in Orlando and Altamonte Springs.
Authorities released a photo of the suspect wearing blue nurse style scrubs.
According to police, the same woman stole a wallet from an 87-year-old in the Savannah Court assisted living facility in Oviedo.
Police said she charged $4,000 at an Orlando Target.
The suspect is targeting the facilities by blending in with staff members and employees. She has not been identified as a health care worker at any of the assisted living facilities, police said.
According to authorities, the suspect drives an older model BMW.
Police are also searching for a man who, they say, was with the woman as she was using the charge cards.
"I would think that you'd have to be very desperate and miserable to be able to take advantage of anybody but especially the elderly," said Andrea Dolce, a concerned Orlando resident.
Emily Reyes, whose sister lives in a nursing home, says she's concerned about security.
"They have to have more security at these homes; watch who comes in, make sure they sign in, what time they walk in, what time they leave," she said.
Anyone with information about the suspect is asked to call the Winter Park police or Crimeline at (800) 423-TIPS.