Shelby Eisenburg is a guest character introduced in "Girl Meets Elite ANT Force Whenever". She is from the show "Best Friends Whenever." Shelby is Cyd's best friend, and has the ability to time-travel as long as she and Cyd are touching and thinking about the time they want to go to. She and Cyd were convinced by the Elite ANT Force to use these powers to save the world, and they have since been doing that.
Shelby dated Barry and married him after being trapped in a time warp for 14 years. They adopted two time-traveling kids named Shelly and Barry Jr. It is revealed that Shelby is infertile. She was murdered by Victor Krane who used her drug addition against her.