1. Jack has a very strong magical root somewhere in her ancestors. It's why she and her half-brother were magic, as well as her two cousins, despite all having a significant amount of muggleblood, Jack being a muggleborn herself.
2. Jack's not really a mom to Sunny or Goose, nor does she have any pretensions of this, nor do they. She's much more of a cool aunt. Cool being a very lose term.
3. Jack has never touched drugs, nor does she have any interest in them. It's not a moral or ethical thing against them, it's just never interested her. Adrenaline is her drug.
4. Jack's hands are very rough, very calloused. Not at all feminine in the classical sense.
5. Jack's second best Quiditch position is Keeper.
6. Jack's house never runs out of bacon. It's a favorite all around.
7. Jack rarely buys new things. Having to rely on her uncle through school kept her from feeling comfortable asking for enough money to buy things new. She got used to secondhand. And she's had tight spots financially, so it's just become instinct to use something until it is all used up.
8. Jack's mastered her old habit of her hands shaking when she was upset. She's become very loose when angry.