I think the last anon did a really good job summarizing it. My favorite “troubled Diana” articles are these:
https://www.vanityfair.com/news/2007/07/diana200707
https://www.vanityfair.com/style/royals/2013/09/princess-diana-love-hasnat-khan
https://www.huffingtonpost.com/entry/princess-diana-mental-health_us_599705b4e4b01f6e801e4152
https://www.macleans.ca/society/life/dianas-damage/
https://people.com/royals/why-princess-diana-left-her-sons-to-vacation-in-paris-with-dodi-fayed/