The usage of だと and それなりに in this sentence


I ran into this sentence and I'm a bit confused.

> 魔法の事についてだけはあいつも **それなりに** 真摯なの **だと**

I guess I'm more confused about the "da to" part. Is this supposed to mean
"suppose to"? And so the sentence would be _"When it comes to magic alone
she's supposed to be earnest/sincere"_? Or is there any other usage for it
that I'm missing?

I'm also a bit unsure if それなりに has any important significance in this, like "
_she's supposed to be sincere in her own way_ "? I've read some examples of
this expression being used and it never seemed to change anything meaningful
so I'm a bit stumped.

I don't think the follow up sentence is important to the context but I'll
leave it here anyway.

> なぜそんな買いかぶりなどをしていたのか。




**と**

On the contrary, your following section is super important, so that I can know
the と isn't at the end of the sentence but qualifies the next verb.

The whole clause before と is supposed to go to a verb phrase 買いかぶっていた "had
been overrated", which is separated into two parts 買いかぶり + していた during the
insertion of など, making the original form obscured. After all, the entire
first clause is explaining how the speaker overrated her.

と as quotative case particle can qualify any verb that means mental activity
to detail what's actually said, felt and thought.

**それなりに**

> _in her own way_

No. "In her own way" is **彼女** なりに. Here it is **それ** なりに. Since それ "it" is
too vague to tell actual things, それなり is more like an idiom as a whole: "so-
so", "somewhat", "decent(ly)" etc.




**と**

On the contrary, your following section is super important, so that I can know
the と isn't at the end of the sentence but qualifies the next verb.

The whole clause before と is supposed to go to a verb phrase 買いかぶっていた "had
been overrated", which is separated into two parts 買いかぶり + していた during the
insertion of など, making the original form obscured. After all, the entire
first clause is explaining how the speaker overrated her.

と as quotative case particle can qualify any verb that means mental activity
to detail what's actually said, felt and thought.

**それなりに**

> _in her own way_

No. "In her own way" is **彼女** なりに. Here it is **それ** なりに. Since それ "it" is
too vague to tell actual things, それなり is more like an idiom as a whole: "so-
so", "somewhat", "decent(ly)" etc.

