Here's another possibility…

She may think that in this moment you have issues that would hinder your ability as a T BUT she believes that with work, you could be just fine as a T at some point.

OR she is concerned that your wanting to be a T is a temporary phase but wants to withhold her opinion to see how you develop this on your own.

She may have doubts, but maybe feels they can be overcome with work?

Follow your bliss!