A "latch-key kid" is someone whose parents are so busy that the kid is alone most of the time and they have their own key to the house.

Not gonna lie, this definitely explains a few things.

6192991 Wow, that's really sad. That at least explains part of why she was so close to Sunburst, and why her parents never tried to help her cope with it.

6192991
Funny enough this already fits perfectly with my headcannon.

I'm really glad they went this route. All my educated guesses about what they didn't have time to air revolved around her parents not really being around.