Or maybe not so wealthy. We can see that Bella comes from a well to do family, but there is NOTHING to suggest they are wealthy in the conventional sense. NOTHING. She could be nothing more than the single child of a high earning double income family who dote on their daughter. That easily explains her shopping and dining habits and her "race" car.
Her mother is in the position to earn $250K-$300K per year or more. ASSume her father has at least equivalent earning power. So they bring home $500k-$600K pre tax. That's an extremely comfortable life style, but it is not wealthy. Proof of of wealth would be a weekend on their private island or some equivalent display of raw wealth. Until we see something like that, statements that she's from a wealthy family can not be supported.
I have no idea what dollar you're thinking of here..
In the US as example. (Especially as it's fair to assume SG is in the US, or similar.)
An average household income yearly, is around $65k - $70k, by 2020 median...
Well off would be considered middle-class... which is $150k - 200k yearly per household..
Above $200 is upper middle-class.. $300k and above yearly, is top 6 percentile. Which is considered wealthy.
So if you're assumptions are $500k - $600k yearly pre-tax, it's very wealthy, even rich.
Enough to support several families.. 7 - 8 'average' families.. So way beyond 'Extemely comfortable' for one household.