It sounds like your real concern is whether or not she's worthy of your trust. I think a T expressing doubts about the therapeutic value of how they're conducting the therapy can often cause exactly the sort of concern/fear you express. It strikes me, in most cases, as a mistake--that such doubts are best dealt with in supervision, and if it's determined that a change needs to be made, then it's the T's responsibility to make the change, rather than communicate doubts to you.