TWH are great horses once they're trained. I have rode many hot headed horses and I would say TWH aren't hotheaded just a little opinionated. But if she is more of a beginner a older horse would do her some good for her.
not necessarily, but if she hasent ridden much, maybe take it down a notch, if you get the horse, maybe have a trainer work with both of them, and if you dont, maybe get a calmer horse that she can work with.
Well TWH can be very hot headed and spooky. If she doesn't have a whole lot of experience with horses I definitely wouldn't recommend it. I also would recommend them for a first horse. We have one at our barn and she jumps out of her skin at nothing. Also sometimes TWH being gated can have a hard time with the tight turns required for gaming.