Dirkdj
I am sorry about your mother but it would be a travesty of science to suggest the cause is statins, assuming she has been taking them.
This is not a peer reviewed paper but a blog on an unknown site making claims about stem cells, referencing other papers which look at single relativities. You simply cannot put them together to create a hypothesis. I wouldn't even go as far as Pace and give the blog the credibility of a claim.
In fact there is some evidence that people taking statins have a lower incidence of some cerebral degenerative changes.
The Internet has been fantastic at enabling the general public in medicine as other fields, but just as that advert for an aircraft at an unbelievable price might just be a scam from a nice friendly man in Africa, so may some medical claims on the web also need to be taken with a pinch of salt.