I'm not sure if anyone has suggested this yet, but it might be a good idea to enroll your daughter in 4-H and lease a horse before going through with a purchase. She would learn everything she needed to know about horses by having a project and being guided by a mentor (usually your club advisor can recommend reputable trainers in your area and pair her with a mentor). You would learn about all the horse's needs too by helping her and attending lessons and events with her, have the benefit of taking more lessons on a good broke horse with way less responsibility in the beginning, and gain valuable veterinary/blacksmith/feed and hay supply contacts for when you are actually ready to purchase your own. You might even be able to purchase the horse that you lease if you find the right person (and horse). It would definitely help you know what you're getting into!