Like a Switch was Flipped

Mom writes:

She was going back to her bathroom when I heard a sound.  She came flying back into the living room.  "Who was here?  What were you doing?"  She was almost shaking.

  

I told her to settle down because "I have no idea why you are so mad.  Show me."

  

So we marched back to the bathroom and she pointed.  She wouldn't even go in.  

I burst out laughing and said "Your Uncle came by and he did use your bathroom."  

It was like I flipped a switch.  She was so sweet and changed her tune.  "Oh, ok."  You can figure out the problem.  Yes, he left to seat up.  

Nothing more was said.