The National Weather Service continues the heat advisory through Tuesday afternoon. Temperatures once again on Tuesday will rise to the upper 90s however high humidity will make it feel like 105 to 110 degrees.
The York News-Times says Stacy Findley made her plea Monday in York County District Court.
Findley had been working at Petro Fuel Island in York. In February, a manager at the station showed police a security video.
The manager says the video showed Findley doing a return and refund, but no customer was present.
A court affidavit says Findley admitted to taking more than $1,400 in her refund scheme, which she says she started on Jan. 5.
Felony theft carries a maximum prison term of 20 years.
Her trial has been scheduled for July 19.