I'm sure there were several factors. What do we "know" (as reported)?
1. There is a suicide note we are not privy to. Those that are privy to it do not deny that shunning may be a factor - but they may just have kept silent as per protocol. Will more be allowed out later?
2. Joyce Taylor - Lauren Stuart's "close friend" certainly believes shunning was a factor - to the extent she planned and had an accomplice record her at a Kingdom Hall just two days later (now - 23/2/2018 - on over 40K views BTW) - but maybe a personal axe to grind over this issue?
3. The latest New York Post says she (LS) was brought up in the JW's - so I wonder if her parents or siblings shun her? This would have more effect than the local bozos at Fumbuk Central Kingdom Hall.
4. Also mentioned was a personal problem? Did this tip her over the edge?
Other surmisations -
She might have been POMI to an extent.
There may be a record of mental health issues. (Obviously she was "nuts" to do what she did)
Image and appearance seems important. Not many 45 year-olds go for a "modelling career". What was she trying to do to make herself feel good? What insecurities rushed to the surface? Was it all about to come crashing down?
Tragic and sad.