In the first one, she and Libby were the first to figure out that Timmy and Jimmy weren't one and the same. When Timmy asked for help with Jimmy's inventions (which he stole from his lab), she seemed touched by it. Then when they're on a date, Cindy keeps fawning over Timmy, who is acting like a complete fool and Cindy ignores it. When Goddard is turned into a scary robot monster, Cindy and Timmy refuse to do anything and continue their date. When Decimator Goddard eats Timmy, she helps Timmy stop Goddard from wrecking the city. Then, she stupidly thinks that Timmy set this whole thing up so she could solve it.