I don't mean to speak for Clover so she'd have to clarify herself if she comes back to see this, but I think by "look" she might have actually meant "sound" given the way the rest of her sentence reads. Maybe she said "look" because she is talking about how the text itself appears to read when compared against the audio and possibly Minfillia's body language.
In any case, my understanding of her argument here is that Minfillia's way of saying something reflects on her personality and even this admittedly subtle changes can mark quite a notable difference when it comes to both the perceived character development and our own interpretations of a character. So to use this example here, her comment about Minfillia's reply being "direct, calm and business level" likely means that the english text reflect's Minfillia's disposition in this situation toward being in a more relaxed and level-headed state and a character that is comfortable turning to the WoL, whom clearly appears troubled, and asking what's on their mind with a comparable stocisim to that of the older and more weathered Scions. On the other hand, the Japanese dialogue reflects her insecure and sheepish nature, more akin to a character that is both sincerely worried and perhaps a little afraid to talk - like she is still trying to find her place in the group as a character who currently feels troublesome and worthless.
I think if you settle on the fact that the 'basic message' still comes across just fine then you are only scratching the surface of the debate. Nuance is everything when it comes to storytelling and while you can argue that this sole example in itself amounts to very little - if anything - in the grand scheme of things, repeated instances of this can really alter the way a character comes across overall, at least in my opinion.
Though with all of that said, its a little frustrating to listen to myself argue for the consistency of Ryne's character of all people considering how dissatisfied I was with how she does a virtual 180 at a pivotal moment later on, but I digress.