I thought the split was something like 55-45 for Youtube vs the creator. This sounds more like 66-33, is this typical for other creators / influencers as well?
The RPM she achieved is excellent (average in many niches is $1-$2), she could have been incredibly successful if she trimmed down her production cost.
If production had cost her nothing she would only have made $1k a week, for something that would have taken up half of her time.
There are very successful people making high budget video and very successful people making shoestring video on YT. She didn't really have the following to do either. The success that she had on YouTube was driven by her following elsewhere, and she only continued losing money for so long because she was motivated by non-YouTube goals.