What was the show in the 80s about a girl (I think Evie) who could stop time by pressing her index fingers together and she could talk to her dad through a glowing cube or crystal?
This would be the US television show titled "Out of this World".
The show aired for four years, from 1987 - 1991, and the main character (Evie) was the daughter of an alien, so was only half human. She had the ability to stop and start time, either for many people or on an individual basis. She could also had telekinesis (called gleeping in the show), and conversations with her father were conducted through a cube that he gave her.