Anonymous wrote:
You gently lay a hand on her arm when she's in full spate and you two are alone, lean in and say in your kindest, most sincere voice: "Please don't feel you need to justify your purchases to me, Larla. I'm glad you can buy all this stuff. It makes you happy for you."
Maybe somebody else is jealous around her, and she's afraid of offending everybody.
This. Do it discreetly and kindly.
Also ignore the trolls saying why does it matter and it's not your business. They are just miserable people who post nasty messages on an anonymous board trying to make people feel as bad as they already do. This is a friend. Of course we care about friends.