As for Caroline she does need to fix her technique. It may be fine for her now, but her technique could hurt her when she grows and it could hurt her ability to develop triple/triples.
Caroline is aware she needs to fix her technique, especially on the lutz. She mentioned that during US Nationals interviews.
But considering how few of the ladies attempting 3Z landed them cleanly, it seems that not many skaters have a good lutz technique anyway. The takeoff is just one part of the jump. If the takeoff edge is correct but there's a failure elsewhere (height, rotation, one-foot landing on the sweet spot of the blade with no hands down) then the technique is just as faulty.
Mirai rocks!