She's doing the poor, fat, lazy person's Pretty Woman revenge fantasy; she can't walk into the store looking like a lady carrying armoloads of shopping bags, so she goes on Yelp and pretends she can. "I spent 20k somewhere else! You work on commission, right? &c." but it doesn't work, because we all know she's a liar. If she really drove a 250k car, she would have said she drove a Rolls (or whatever) or even stated the model like a Wraith or something, not given an amount. (She probably doesn't even know what a Rolls-Royce Wraith is, anyway; she's clearly dumb as shit and poor, because 20k is nothing when it comes to jewelry in BH, and wealthy people do not go jewelry shopping with a set limit like $20k to begin with).