She's just taking back what is rightfully hers. Lol.
This is a good level of revenge for a 10-year old to manage. Hopefully it isn't the end of the revenge. It might come as indirect consequences rather than her directly continuing it.
Hopefully we see the immediate aftermath. I hate when you're just left hanging and wondering if the loathsome group is suffering, or if they even cared.
I also hope she let's them know it was her, like a last middle finger to them letting them know they messed with the wrong person.
A skill able to copy keys is just random "everyday" magic in this world? It seems like keys would be almost worthless in this world then, only useful so long as someone can't even touch them in the first place. You'd think a world where anyone can effortlessly duplicate a key would have a locking solution that isn't keys.
Technically it's mostly her property, but I appreciate the reincarnator is abusing a broken storage skill without it having to be spelled out painfully to them.
can she learn new things or is she stuck with those skills? i mean she's already op but if a strong knight appear she might be in danger, a solution would be if the author mixed light magic with healing magic, i don't know why they were 2 different things if in fantasy light magic also heals and is much more useful for shield and attack