It's possible that this is total fabrication but way more likely that there is a nuance that you didn't get. People supervise and evaluate trainees in many contexts and at many levels and it is entirely possible that your T did not or does not work with the regulatory body that you contacted but still worked or works in a supervisory capacity. Trainees have to pass many evaluations before they can become licensed professionals. There may be evaluations at the school level, at the state/province/national levels, at the college/board level, at the subspecialty level etc. People also may work or have worked in different jurisdictions.

That doesn't necessarily mean that what she told you is untrue, only that you may have taken it to mean one thing while it actually meant another. I would not "confront" her as such. Express curiosity if it is that important to you, but definitely don't act like your sleuthing has yielded the goods on her.