Can someone verify the reasons I give for using a "wa" and "ga" in this sentence?


> 私の生みの母は、若い未婚の日本人だったため、私を養子に出そうと決心したのです。彼女 **が** こだわったの **は**
> 、私の養子先は日本に住んでいる家族でなければ、ということでした。

The highlighted "は" looks to be there for _thematic reasons_?

The highlighted "ga" looks to be there for _neutral description_?




The only reason が is used here is because 彼女 is the subject of a **relative
clause**. Relative clauses don't have topics, so が is used instead of は.

In a main clause, the が in 彼女が would likely be exhaustive rather than neutral
(because it would be weird to have a neutral が attached to something already
in the "universe of discourse"), but here in a relative clause that's not
necessarily true.

The は, on the other hand, is a plain thematic は. It's a very common
construction to have the topic は follow a nominalization:

> 禁煙したのはいいことだ。  
>  It is good that you have quit smoking.

In other words, は is used here simply because there's no reason to use が.




The only reason が is used here is because 彼女 is the subject of a **relative
clause**. Relative clauses don't have topics, so が is used instead of は.

In a main clause, the が in 彼女が would likely be exhaustive rather than neutral
(because it would be weird to have a neutral が attached to something already
in the "universe of discourse"), but here in a relative clause that's not
necessarily true.

The は, on the other hand, is a plain thematic は. It's a very common
construction to have the topic は follow a nominalization:

> 禁煙したのはいいことだ。  
>  It is good that you have quit smoking.

In other words, は is used here simply because there's no reason to use が.

