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from what I remember she was buried under the rubber waiting for the ml and a lot of time has passed and her leg was too broken to be perfectly fixed. So even if she wanted to run away she literally can't . Also her leg was forcibly fixed by her mother's command even though she was against it especially since it'd not only look "hideous" by their standard it would also hinder her walking normally (I dropped the novel after hearing other spoilers)

If thalia was smart she would have used this opportunity to fake her death and RUN, enough of the fucked up family and constant disappointment from ml just go find your happiness somewhere else