Indeed we don't know what "didn't get on" with the supplement means. Perhaps it gave her the trots or something (though to be honest, I've read little about this case).
It seems likely that she's just taking an over the counter, legitimate supplement... and was probably completely unaware of the controversy surrounding the product. It's unlikely that the shop brought the problems to her attention... and why should she go searching for information about it? It was legal and on sale in mainstream shops, just like the Tesco burgers I'm having for tea tonight... I can fully trust them to be perfectly OK, without checking the internet for information
To take the sugar coating off... I think the OP is indeed being crass in using words like stupid, foolish etc about the girl. The 'stupid and foolish' people were the people making money by continuing to manufacture and supply it to consumers.
And though it's sometimes nice to be forthright, there are some occasions where it is socially unacceptable to just shoot from the hip.