Everything for her is disposable. The flats, knick knacks, furniture, even Jane. She's just addicted to shopping as it fills a void. She also places no value with regards to her stuff and doesn't take care of them. How many times has she used her expensive laptop as a table for her food? She even placed mugs filled with hot tea on it. Her mindset is if it broke, buy a new one, if I get bored of it, shop again! She buys things before thinking about it as well.
Gabbie is essentially a child with too much money pretending to be an adult.