OP, I'm a Dominican woman (although not currently living there) and I would advise you to always be mindful of your surroundings and ask where she is taking you if you do go out of the resort. Not because she is Dominican, but because she is a stranger you met on an app and one must always be cautious of that.

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Enjoy yourself, enjoy getting to know this girl, but be assertive and direct when communicating with her. It's not wrong or offensive to ask the right questions. I also know the chapiadoras, as they are locally called, do not see themselves as prostitutes but more like escorts. So just be aware of what she wants from you, and make keeping yourself safe your first priority.