How long had it been since her grandpa disappeared? Days? Weeks? Months? Pan couldn't remember anymore. When he disappeared, seemingly forever, everything inside Pan disappeared.
No one ever talked about Grandpa since he left. Grandma, Daddy and Uncle Goten seemed angry for all his disappearances. The only one who seemed to care besides Pan was Krillin. But he never said anything either, not wanting to risk the anger from two half-sayians and a dangerous old woman. Pan had forgotten her grandpa entirely, but she couldn't forget his bravery. Yeah, she did understand her family's anger, but she also understood why Grandpa did those things. He cared about the world, more than anyone could ever know.
He didn't want the Earth to be destroyed by anyone willing to challenge him, so his only option was to leave Earth. But it had been too long. Pan wanted him home. But she couldn't do it alone.
So that night, she told Uncle Goten and Daddy her plan to go find Grandpa. And her fathers response was to lock her in her door and window, saying she was grounded indefinitely. Pan didn't appreciate being locked up. Made her feel like a caged animal. So in the dead of night, when her parents were asleep, she got her robot/Dragon Ball radar Giru break the window lock. Then she packed up some clothes, food and flew out the window. She was getting her Grandpa back.
No matter what.