Just a note- We had a Friesian come from Wisc to Missouri, and he did not agree with the heat and humidity. I am sure some of the issue was he was black, but it he overheated very easily (and he wasn't even over weight!)
Going to a hot arid climate like Texas could be a rough transition for a heavy girl like this mare. Even when this horse was fit and schooling 1st and second level dressage he still overheated more easily than the other WB's. I'm sure this isn't the case with all Friesians (obviously there are many that live in hot states lol) but it is just something to keep in mind when considering staring this project!
Best of luck! She really is adorable!