Making my own Estrogen

Today, I was told that a transexual person had taken Estrogen for so long that her body had started making its own. Hmmmmmm

Well, I knew that there is some Testosterone in the body of a female, and it could seem reasonable that the body of a normal castrated XY male could have a little Estrogen in it even with out using pills, patches or shots. It seems rediculous that a T girls body could produce enough estrogen on its own.

So, knowing full well that there are those here who have substantial medical expertise, I thought I'd ask if it can happen that way. Now, I will have to say that it is to my advantage for certain people to believe it can happen that way, so I am going to stifle the urge to fall to the floor and laugh until I expire or something like that.

What say you?

Khadija