I'm in Massachusetts so it may be different in your state, but we have pretty strict requirements for licensure and there is no license specific that designates someone as a supervisor of Masters level clinicians or trainees. I work in the the field and the requirement for clinical supervision is that they're licensed independently for 5 years (LICSW or LMHC). If the supervise is not a candidate for licensure then the independent license is the only requirement. If a supervisor has concerns about a supervisee who is applying for licensure then they can refuse to sign off on the hours and even address the board, as your therapist says she did. It is an odd story to make up considering the details are unnecessary - is it possible she phrased it in a certain way to make a point? If it really bothers you then of course bring it up because anything is possible and if she's lying that's a big concern.