It's also implied that she'd done this a few times before.
Bulma uses the diamond to pay Roshi back for not returning his submarine, but reverted to her bad form and stole it.
Toriyama tends to have a unique sense of humor, leaning toward uncomfortably creepy and most of the time Bulma is the butt of these jokes.
As present Goku is older than her, Bulma calls him Mr.
Two days later, the arrived at to find the next Dragon Ball before the finds them.
Oftentimes, throughout the Dragon Ball series, especially before Trunks was in the picture Bulma would help the fighters.