microDOS has annoyed miniDOS - or G, as Cheryl and the askblog population now call her - to the point of no return.
The bell and string are on micro to find her when she gets lost in the nooks and crannies of Cheryl's apartment. It's fairly easy to look for a neon orange string, and then grab the bell to pull micro out of wherever she's gotten into now.
When micro first turned up, she insisted on being as cranky and annoying as possible, which is why G's patience with her is a bit....short.