My girlfriend is a new backpacker and we recently went on our first backpacking trip together. She had blisters coming in wihin the first five miles. She has fair skin and a history of easily blistering. At this point I don't think and amount of breaking in boots will do the trick. I'm personally leaning towards a type of hiking sandal and keeping her pack weight under 20 and closer to 15 if possible. Any tips would be appreciated. My main concerns are with ankle support and rocks scraping the foot. Any help would be much appreciated.