Lots of providers, even the seasoned ones, do not do background or reference checks. They are simply cautious with what and how they communicate with you. As long as you never discuss money or the specifics about services you really don't have much to worry about. Without knowing anything about who you are referring to, I am guessing she may be the type where no donation is ever discussed or presented when you meet and its simply left on a nightstand in an envelope when you leave.
Even prior to having review history, white lists, and P411 membership, at least 90% of the providers I have seen, many with pages of reviews, did not require references or work info.