My fourth is finishing college now so I'm on the other side of this and my advice that I would give myself if I had a do over was. Tell you kids - Pick a state school you want to go to that we can all agree we can afford - that's what mom,dad,grandma, etc can contribute and you taking out full financial aid (~21k total for four years). If you want to go out of state you need to find a situation where you will be paying that much or less on room and board and tuition. (travel and other will be above and beyond) If you cannot than it is off the table. Some schools offer tuition breaks, scholarships, whatever. Bottom line - out of state isn't worth it unless your kid is in a situation that enabled them to make it affordable (merit scholar, big scholarships, etc). Out of state is beyond ridiculous.
Being in 8th grade, you have plenty of time starting now to let her know what you can/cannot do. You aren't saying "no" to out of state, but she herself is going to have to find a way to make it possible.
Without "help" out of state isn't how much more it's how many times more. Being in Texas there are many great schools to choose from.