Help me find this pls!

I’m looking for a manhwa that is similarish to Ashtarte. This girl is reincarnated into the “evil” twin but really she just has dark hair and the rest of the royal family has silver. This isolation coupled with her sisters talent in controlling elements (I think) drove her down a dark path where she constantly was mean to everyone and tried to do what her sister was doing (obv failed) which fueled her hatred more. However, after she was reincarnated she started fixing her bad ending/the overall ending and started to realize that she just was gifted at something else and she’s like extremely smart. Her sister seems to like her and she’s doted on by her father too. I also know that she was abusing her slave and is trying to make things right so he doesn’t rebel against her kingdom. Thanks!!