I'm not going to deny that DeepL is a pretty impressive piece of software, and it certainly has its uses.
It's very helpful for people who don't speak Japanese to get the general gist of large documents, and for documents written in a relatively straightforward manner, the translation can actually be surprisingly functional (though often with some glaring mistakes, as anyone who has had to proofread or accuracy-check a DeepL-translated document can tell you).
That said, I really can't approve of proposing it as the use of machine translation (of any kind) as a way to better understand Japanese -- especially literary or creative Japanese. KarenK clearly has a high level of Japanese, and the questions she raises are usually about more abstract expressions that require understanding of context and interpretation. Just plugging the text into a translation algorithm is not going to offer her any real enlightenment, and will in many cases be completely unhelpful, misleading, or outright wrong.
In this case, I was able to find the full context and can say with confidence that the DeepL translation is completely inaccurate (and somewhat nonsensical).
Clearly, from context, it's her feeling the what is described before the sentence in question that are resulting in her disappointment, not a certain level of disappointment in her life resulting her feeling these things. (～XほどY or ～XほどにY can mean "so Y that X", i.e. "Y to the extent that X", but that interpretation doesn't logically fit here.)
KarenK, your initial interpretation on target, and it's worth pointing out that although the ～ば…～ほど "the more...the more" expression is almost always introduced as a single inseparable unit in textbooks and grammar references, very often in actual Japanese the first part is dropped.
