Millions of Americans were "able to" buy houses in the mid-2000s. The problem is they bought these houses entirely on credit, wholly without the means to eventually pay for them. Cars are also a type of purchase Americans typically take on debt for. It is slightly more difficult to obtain a loan you shouldn't qualify for these days, but there's plenty of opportunity in the US for those who want to get in over their head.
The problem with a story like the quoted is that it presents the superficial elements of someone's lifestyle without giving any actual insight into the fundamentals (i.e., budget) on which the lifestyle is based.
So, I guess stuff like this might seem surprising to those unfamiliar with US culture. But my point is it may only seem surprising if the assumption is the person actually paid for those things. It's highly unlikely that a house, car, and kids are in the clear on a part-time waitress salary, and more likely that the person is up to her eyeballs in debt and neglected to mention it.