I think it's safe to say you could donate Smelle's wardrobe to five women and each of them would still end up with more clothes than an average woman.
Smelle is deeply unhappy because she cannot find security and stability in life. She tries to suppress these feelings with the high that shopping gives her but it's only temporary, so she needs to buy more and more.
First, her childhood was spent without a father and that's not because he was dead, an alcoholic, a criminal but simply because he wanted to remove himself from Spermbrows and their daughter. While the mother provided Smelle with all material goods and until this day remains a helicopter parent, she couldn't make up for the imbeded hurt that Smelle is feeling even now - her biological father never met her but decided he didn't want to know her, be in touch with her, spend time with her.
Then, she got into her head that life will be perfect if you emulate a Disney fairytale. You have to be attractive, feminine, a good homemaker, and you'll easily find the man who will love and worship you forever. However, the world is not a fairytale and there is more to maintaining a stable relationship than wearing a ton of hairspray and nail polish that matches christmas tree decorations. She goes for men who aren't dying to be husbands (maybe apart from Rickets) and are focused more on their career and general appearance than impregnating their wife and becoming her ATM until death do them part. Smelle wishes to be a luxury tradwife but the men she dates have no interest in being tradhusbands.