Options:
1. Born evil - pretended to be a harmless
2. Something demonic entered her before entering the palace
a. like the case of the one villainess who was originally human but due to dark magic, was born as a human but with a demon soul
3. Her desire for better treatment invited something evil in her after entering the palace (invite as in attracted the entity)
4. Her desire for better treatment led her to become evil and invited dark practices + evil (she made a way to invite the evilness herself)
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I hate how children who are by-products of their parents' infidelity have to suffer such treatment. They should hate the parent and care for the child. But for the benefit of the doubt, maybe their repulse came from them detecting.(unconsciously or consciously) that she was evil
I agree with you 100% but I think the reason the child is hated is cus:
1. The man of the house (atleast back then) was the bread winner so the wife and kids couldn't hate him cus they needed the money
2) the illegitimate child was a constant reminder of what the parent had done