The fine was given to Ms Allen, from Lincoln, on Thursday, August 18 at Bridge Street Car Park in Gainsborough after she had been charity shopping with a friend.
She said she purchased a £1.60 three-hour-parking ticket at 12.11pm, and returned to the car at 2.45pm.
She is now facing a £25 fine, which will turn to £50 if the issue is not resolved.
Ms Allen told LincolnshireLive: “We went off and came back 20 minutes before the ticket had expired and was astonished to see a yellow thing on the windscreen.
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