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There are numerous Ladies-Only courses/instructors in the Houston area. Since you mention Galveston as well, I will assume you're more toward the south-side of town.

The Arms Room in League City has some excellent women's programs, as does Shiloh Indoor Shooting Range in Northwest Houston.

CompVest here on the forum runs excellent ladies classes, and to my knowledge, offers her courses at various ranges throughout the area.

All of these programs are excellent and come highly recommended. Although my wife hasn't yet participated in any of the classes, I've personally watched segments of all of these instructors' classes at various ranges (just happened to be there when they were,) and I've been highly impressed with what I've seen, and each offers instruction for shooters from first-time to expert level.