@TheDragonLord it would also make sense, but my head goes: not enough bullying... i am really expecting the worst from that family. so i bet it will be bad intent stacked.
1. the teacher was ordered to not teacher her at all 2. the teacher decided to be abusive on their own 3. others treated her like trash after hearing the 'results'
also, with how much she repeated the whole i am trash... it really feels like the author wanting to say: she is great tho. 'plot twist'. so i am expecting her to be good at both now.
but i could be wrong, and, like you said, she simple didn't have the tool or were walking on the wrong path to be able to shine. but i think the divine only would be more likely than sealing. because one she showed ability to sense some sort of magic and two they don't 'seem' to have a reason to seal her (only if it was for protection somehow, due to too much magic or something). but then it would be another weird point to think about when reasoning why they sent her to the people that didn't care about her at all, without no one to look after her. they cared enough to seal the issue, but not to take care of her? at least sent someone to make sure she was being treated as a human being (and taking care of the seal and essential needs).
so far the most reasonable explanation would be they sent her away because of the father mourning, and they expected she would be treated okay. but that is still weird considering how they have been treating her so well. showed care and worry. but somehow they spent years without making sure to visit her and see if she was okay? only sending some money. i am really curious how the author will explain that, as i feel things are quite weird now. the way she expected them to be is actually more logical than what they really are (she really had bad expectations from them). [it is sweet tho to see her finding a place to be, i hope it was all a misunderstanding and things don't take a dark turn somehow, that would be a big twist].
only waiting to see, we will get to know soon enough i feel, with her showing talent more and more. maybe with that we may get to know why she was even there too, because they all seem so chill with her presence, even the dad that seem rather 'weird' at first, he didn't show the normal resistance from the 'you make me remember my wife stay away' kind of conflicting thoughts.