Does the test

Slowly raising her skirt just enough to get her hands underneath Jessica grasps her panties waistband and lowers them to her feet.

Taking the thermometer from her mother she raises her skirt again enough for her mother to see and inserts the thermometer into her cliterous holding it in place as deep as possible without disappearing so as to get it as warm as possible.

Her mother kept a close eye on both Jessica to avoid trickery and on her watch for the full 3 minutes as the instructions suggested by which point Jessica was bright red with humiliation handing the thermometer back to mother and dropping her skirt she went to pull her panties back up as well but her mother stopped her.

"Just one minute young lady leave those down, if your not sick your getting a spanking!"