Mate, everyone has "ulterior motives" in social settings. Say you go chat up a girl on the street, you find her hot and want to fuck her. Do you announce straight up that your motive is to fuck her?
My point is almost nobody is completely transparent in these scenarios. If you tried to be like that, man, people will think you're crazy!
Back to your "situation". If you're really attracted to her you wouldn't be asking here what to do so I'll ignore that possibility. That's an automatic GO in my book... Life is too short to be worried people are getting a piece of you!
So you just have to think back, during your sessions there with her or with other girls in the shop, did you blab about how rich you are? Do you have reputation in the shop as a "big fish"? Or do you flash a lot of wealth?
If you don't do any of this, you can rule out gold digging as a motive. It's probably all physical then.