Should I tell her I'm broke?

i've never dated a woman, thai or otherwise, who wanted money from me so dont have similar experience however common sense tells me...

honesty and managing expectations are usually the best way to go in a relationship.

and at least you'll find out of she loves you or your money and therefore whether you're wasting your time with her.

Have you dated any Thai men who do not want money, or maybe you just do not date.