When did this start?

Saturday, December 29th, 2012, my sister and I took a trip to Ottawa to visit our aunt and to go shopping. The next morning, we woke up and had some Rice Krispies accompanied with some 2% milk. The only reason I remember this date was because of the car ride home. The first 15 minutes home was fine but as soon as we hit Kempville...things went down hill. My sister's face turned pastey white-and that's saying something because her skin shines like a dimond in the sun light its so pale. She kept saying she was going to be sick and her stomach was practically serenading me with some sort of whale noise.
As soon as she got home and made a complaint to our parents, they took her to the hospital just to calm her nerves. She walked out with the nurse balling her eyes out. My parents were expecting the worst. The nurse stood with my partents and said, "Well, she's not dying. She's not sick. She's lactose intolerance." My dad lauged and they came home.
Experts say that lactose intolerance is congenital disorder consisting of an inability to digest milk and milk products; absence or deficiency of lactase results in an inability to hydrolyze lactose. I say my sister's stomach is a sassy little princess who hates any dairy products and will punish her for ingesting any.
Don't get me wrong I feel bad for her, in a sense, but with her dramatics, it will be the problem of the century.