Is she dating me for my money?

How do I tell if someone is only dating me for my money? I have been on multiple dates with this woman, but she only comes out if the restaurant I choose is expensive. When we aren’t on a date, she is not very communicative and doesn’t tell me much about herself. It’s as if she switches something on and off when we are together in public. She knows about my family and the kind of background I come from, and I am aware that she is not as well off, which is where my doubts come from. If she isn’t genuinely interested in me, I don’t want to continue this, but I also don’t want to be a horrible person and think the worst about her without any proof because I like her. How do I figure out what to do?
You are already judging her based on some parameters that make you question her behaviour towards you. If you like her, but don’t feel an equal amount of affection or respect, her intentions don’t matter because she already doesn’t meet the requirements of a relationship for you. If you know what you want from a potential partner, those are the things to look for first, before you can ask yourself about their intentions. You will know what someone really wants only when you spend time with them but, based on what you have said, if there are already red flags about how open she is with you, these are things you should consider seriously. If your instinct tells you that this isn’t someone as interested in you as you would like them to be, don’t brush that concern aside. Meet her a few more times if you want to give her the benefit of doubt, but don’t avoid facts that are staring you in the face either.

My significant other doesn’t take care of her skin. How do I tell her this without offending her?
If you haven’t figured this out, your communication skills need work.