Apart from the above possibilities, she may just be treating you as "the guest"; it's common for a host to cover everything for someone visiting for out-of-town. If she saw you as potential dating material, she'd be letting you pay. The fact that she doesn't suggests that, um, you're not.
OR she could be expecting you to make more effort arguing over the bill. Taiwanese people seem to delight in starting WW3 over who gets to pay.
Incidentally, just want to add a +1 to Lros's comment above. You wouldn't put up with your mates throwing a wobbly (after
the fact) about some trivial aspect of a night out, so why put up with it from a gf? As said, they tend to do this because they learned it from mum, who criticizes dad for absolutely everything he ever does. It's one thing to consult your mate over important decisions and take her opinion into account, but to allow her to make pisspoor decisions about every aspect of your life because there will be a tantrum if you don't ... that's dysfunctional, adolescent nonsense, and you have the choice to either call them out on it, or walk away and find a grownup to date.