I remember having this issue with an ex a while back.
It resolved itself quite beautifully when she went on holiday with a friend to Gambia,an African tropical paradise.........but not quite,just because this brit colony was a tourist flytrap (like Mexico I suspect for Yanks) it didn't mean that the abject poverty wasn't there for all with a conscious to see.
When she returned home the lust for stuff had disappeared - I think the sight of reality made the need for £250 boots and the rest of the trappings just fade into the past.She became a 'person' overnight.
If you cannot see the truth...........then oh dear
Just cos she's your G/F doesn't let her off the reality hook.
Just my twopence worth
Fitz