My guess would be it doesn't exist and it's just a lie to help her big fake business woman persona
if she's a shareholder that info will be on the shareholding memorandum certificate on companies house which any member of the public with an internet connection can access so an NDA is a bit useless.
Like here's a random company I searched and I can see all shareholders.
ETA I searched her name on a website called open ownership.org to see where she's listed as a "shareholder" and what do you know, no random surprising makeup brands that she's "taking a profit from"