I don’t know how the LessWrong community would treat people like my friend, or whether introducing her to the Sequences would help. It’s not an experiment I want to try unless I have some concrete evidence that it will help.

I don't see much of a need for evidence before introducing someone to the sequences. I teach private test prep and will routinely refer my students to the sequences for reading practice. I sincerely believe it helps, but I'm highly confident I will never be able to obtain reliable evidence to that effect. I am quite confident, however, it does little or no harm.

So unless it'd be costly to get her to read the sequences, how could they hurt?