I've just checked Mrrzy, and apparently it's spelt 'Chilprufe' (proof from chills I suppose)
Like you I had a sister, Barbara, much younger than me. She had a terrible temper and was much naughtier. She always scribbled on things and had a 'logo' which was a stick drawing of a man complete with tummy button. One day she did her stick man on every single flower on the wallpaper in her bedroom. Poor father had spent ages papering that room!
Also, one day when mother was out, Barbara got angry and kicked the glass door leading from the kitchen with her heavy shoe. It shattered into a thousand pieces, much to my amazement and delight!