Mirai is just one of many promising skaters that didn't live up to her potential. What's worse for her is that she seemed to have so much. Or maybe she was never that good. Didn't she always have mediocre (by world class standard, anyway) jump technique? Wouldn't she skate "clean" and then lose a bunch of points for underrotations? I don't think that's fair--I have a serious problem with ur's being worse than falls, and I've said so before, but that's the state of skating today. Either there was something seriously wrong with her jumps, or for whatever reason, the judges didn't like her and wouldn't cut her any slack. It's hard to keep motivated if that's the situation.
Also, did she ever do triple/triples? I don't think so, but I'll go check on YouTube after I type this.