I don't think you need to go that route at all since she will most likely be staying at your resort. Really, no different than one of your guests staying there and taking pictures of your wedding.
Her business resides outside of Mexico and will be claiming that income in her home country... so the regualar FMT visa that everybody gets (on the plane) should be fine.
Please let me know if you find out anything differnt than this.
...Lincoln