If indeed the young lady is not having orgasms (perhaps she isn't, but all you really seem sure of is that she is not vocalizing them to your satisfaction, which is not at all the same thing), I would not advocate either doing anything weird or doing nothing. If she maybe knows what she likes but is reluctant to spell it out for you, I do advocate talking, books (Lonnie Barbach's are the classics, although there are newer and more sciency ones out now) to clarify things and establish a vocabulary, and something like the "Do what I tell you" game, in which you, well, do what she tells you. This allows for giggling and admissions of shyness, plus, it is hot. So is your scenario with the blindfolds and whatnot, although that one does not make a whole lot of sense under the circumstances. You are hot for sound? You like to listen? You wear the blindfold, silly.
PS As for hypnosis and orgasm, there is ... stuff on this. A great deal of stuff. I wouldn't call most of it research.
Andrea is home with the kids and going stir-crazy. Write her a letter! Ask her a question! Send her your tedious e-mail forwards! On second thought, don't do that. Just ask her a question.