So the whole family is breaking in new comfy sandals. Then there is the 13 yr old. I have ordered her several cute styles, but they either haven't fit or she didn't like them, including Keen Bali Strap, Teva Kayenta... She will not wear flip flops or anything between the toes. Any suggestions that I might try. We will be there in August for 5 days of park touring and she'll need a good waterproof sandal. TY!