Gordito's is a good example of a nice start-up...
If one is looking for encouraging signs.................
Agreed, Gorditos fit a need for a DIFFERENT STYLE OF FOOD than already exists here. Did you notice that just around the corner there is another Mexican restaurant now? The Indian restaurant just a few feet away did not make it.
Anyone starting a business here that becomes successful is subject to copycats. Take a drive up to Jarabacoa, for example. A very good and successful rib joint called Parada de Jesus was there. Now there are two more places on the same hill featuring ribs.
The OP has a chance if there really is a critical mass of "gringas with straight hair" that like her services. Then watch out for the copycats after she overcomes the other issues with doing business here.