Who gave her the vitamin test? A doctor? I hope it wasn't one of those written surveys/questionnaires.
iSm, the labels on vitamins won't claim to cure cancer or anything but you get very far into woo altnerative medicine and there are a lot of claims there about such things. A lot of alternative medicines are simply claiming that some combination of supplements (whether in pills or more natural seeming plants) will take care of all that ails you? You've probably seen one of them selling his stuff on late night infomercials.
Here's one, for example, telling you of a doctors 50% cancer cure rate using B12, cod liver oil, and iodine supplements. A couple years ago we discussed here a case of a teenager giving up cancer treatment for an alternative. The alternative was essentially a fancy masking of taking supplements.
But that is why the industry lobbied hard 15 years ago to ensure the exemption of dietary supplements from regulatory oversight. Make minimal official claims and let the nutjobs do it for you.