1. a woman who is versatile, and who can perform many different activities very well.
2. the gender opposite of a Jack-of-all-trades
Jealous Girl 1: I hate Katey. She already has the corner office, and she just finished running a marathon.
Jealous Girl 2: I know, right? Did you hear that she's dating that new guy, Eric? You know, the one with the abs.
Jealous Girl 1: Ugghhh! She even baked this cake for Linda's birthday. And, it's amazing (wiping frosting from mouth.) She is truly a Jill-of-all-trades.