All chores will be age-appropriate and not difficult. Just something in addition to her normal chores.
ETA:DD has ODD. punishments have to be more creative than a time out.
That said. Losing the stylus was not what she was punished for, it was the stealing and lying. Losing the stylus was a natural consequence of doing what she was told not to do and she was expected to make it right.
She babysat her sister while her aunt and I worked in the same room. She got paid for doing so, bought a pack to replace what she lost, apologized, and afterwards got to play a game on the DS with my nephew, that HE chose to let her play. When he asked her of she wanted to her first words were "let me ask my mommy" so I got the message through.