Interesting term DECIDE as it certainly says choice. However, is it really Dorothy's choice to become female or is it a matter of her own path to self discovery that she IS female. Deciding at this point seems then to either transition or consciously repress an intrinsic part of her character, her gender. I think that denial under these conditions is highly unstable.
My experience as a late onset TS has been that I really did not know or consider that I was female most of my life. As a child, I was despondent that I was a male and woke up sobbing uncontrollably when I had my first wet dream. I did not consider that it was possible I could be female and as such was constantly in conflict with males. I never fit in, never understood them, never liked them. I became a loner and dedicated to a 24/7 contact with the female girlfriend/spouse that I was with at the time. However, the expectation by all of them was that I was male and I just couldn't fill the bill. I still didn't figure it out even when I started wearing women's underwear. I could not understand why but I escalated this to clothes and self medicated hormones. I lied to myself, big time. It was the fabric or the better fit of the clothes. I said needed a bra because I had some gynecomastia and needed some support. I said I took hormones to combat a swollen prostate. This was actually true but estrogens are not the normal treatment. I went to graduate school in medical biochemistry so I had some idea what the meds were to do. Not having insurance forced me to self medicate. After a few years, I began to suspect but could not bring myself to seek professional help. In fact, my wife finally told me "You are transgendered" and I said, "What is that?" so I did some fast research. At first, I still denied I was trans but the inner female in me continued to emerge. It then snowballed from there to me fully accepting and now I am in transition.
Now reading this , you might say I am stupid or touched in the head. I assure you that I am of above average intelligence and completely sane. I was trying to be a "good boy" far too long in a lost cause. I wonder if there are any others who needed to discover their true gender, like me?
Maggie