Can you help me with this line?

> 私は母さんを助けたかったんじゃない  
>

  
I know that （ん）じゃない doesn't necessarily make the sentence to be negative and
when it comes to じゃない, intonation matters, so it's difficult sometimes to
understand the meaning when you see it written.  
The sentence I wrote doesn't have a question mark or か at the end that would
have made me believe the speaker is using a rising intonation, so how can this
line be interpreted?  
The speaker wanted to save her mother, she regrets that she wasn't able to do
it, thus I don't think she's saying "I didn't want to save her".  
I'm not sure how the sentence would sound like...
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question
grammar translation interpretation
私は母さんを助けたかったんじゃない (Negative or not?)
Like [this case](https://japanese.stackexchange.com/questions/11916/questions-
on-a-usage-of-%E3%81%98%E3%82%83%E3%81%AA%E3%81%84), じゃない works as an
emphasis. So if it matches the context, 私は母さんを助けたかったんじゃない can be 私は母さんを助けたかった
with emphasis added. That is, not a negative sentence.

===

Using the example in the linked post, きれいじゃない could mean

  1. きれいじゃない? (rising tone) Isn't it beautiful?
  2. きれいじゃない (falling tone) (a) It is not beautiful / (b) It **is** beautiful

The difference (of tone) between 1 and 2 is clear. That between 2a and 2b, to
me, is something like the following.

  * 2a is pronounced like there is a pause between じゃ and ない. Or ない is pronounced distinctly. With exaggeration, it could be written じゃぁない.
  * In 2b, じゃない is pronounced as a single word.

I'm bad at explaining pronunciations, sorry if this is not very clear.

===

I found [an article](https://hermes-
ir.lib.hit-u.ac.jp/hermes/ir/re/15502/gengo0004100190.pdf) on the web. The
sentence in the question should be considered as 強め用法 on page 6.
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answer