Not only is the family rich but they also spoil their kids rotten. No wonder the MC wound up the way she did. She was privileged and spoiled rotten and never felt the need to work and do anything for herself because she was already given everything from the get-go without any real consequences. Remember, her room is FILLED with Chiron merch and that merch is expensive and the MC hasn't worked a day in her goddamn life, meaning that her parents spoiled her so much to let her get all of that merch.
Spoiled rotten? Scummy doesn't like studying because her tightass parents kept shaming her for not being as good as her big sis, so she naturally developed an aversion towards what they kept shaming her over and instead throws her all into escapism
Unless your definition of spoiled is "wasn't tought strong values by her incompetent parents" and it doesn't matter that's she has a highly uncomfortable home environment, or as the title puts it, a hard life