Bring her to the machine

You aren't sure if she believes you of not, but she walks into The Machine anyway.

"I'll be back to check on you when The Machine has run its course."

..........

3 hours later the door unlocks as Mrs Rocks finished her "treatment" and steps out.

"I'm as hot as a pornstar! I love it!" she almost screams.

"Are you satisfied for you care, Mrs Rocks?"

"Maybe I can show you how satisfied with it I am?"

She moves her hands to the straps of her dress. You think you know what she means and it might not be a good idea. Perhaps you can think of another way for her to show her gratitude.