MinxMean
What if the friend of the ancestor is the red-haired woman that Sheila saw in her vision ( origin of the app). Maybe the ancestor provides her with the key ingredient to help the woman invent an item that can level up. She then stores her knowledge and power in it and locks it away. Perhaps Sheila is the red-haired woman descendant, so she was able to activate the system once she reaches a certain age lol. Now I wonder if Sheila's mother know anything about the existence of such magic or she just a rich mom with some power.