Do you want to look at the other side of this Chris? Or is any parent who agrees to let their child start hormone therapy abusive?
Is the child malformed physically or mentally? And if yes, then is that caused hormonally? If yes to both, then a restorative hormon therapy may be useful. Otherwise it is biologically dangerous and should wait till adulthood.
He's one year away from being old enough to have surgery. Hormones at 17 is not an extremely radical treatment. He has been living as a male already for 3 years. His bio mom's comment was "Now I know why he went to school pissed off everyday after I'd fix his hair and put him a dress every day".
Are his genitals female? The biggest problem is to match the sceletal structure with the new body biology. At 17 this may not be too late, but can't be done earlier either. Although, if this is a female to male transformation, then males have usually a lot less scrutiny about their bodies by the opposite gender lovers. In this case, what I would be most puzzled about would be, how to install a working penis on him/her. There are transplant surgeries and these days they are usually successful, but if the underlying tissues are not the right arrangement, then how do you make them work? Genital transplants are usually successful for repairs like bodged circumcision or accident restoration.
He was allowed to legally change his name when we adopted him. He chose a male name. Since he's been getting hormone therapy, his doctor has written a letter declaring him male even though he is one year awy from surgery.
He will have a new birth certificate saying male, and when he gets his driver's license this summer, he will have ID with his photo on it saying male. We will get passports soon after that.
This is not sufficient, and this will not help him. In this case, if this is all that can be done, and a working biological penis is not guaranteed, then she is better with keeping her female body, and continue as a lesbian. This will remain a problem for her forever, until a psychological cure can be found for her condition. If her new penis has a chance of not getting erect hard upon a touch, then she should not give up her currently working genitals. I would advice her for a lesbian lifestyle then as opposed to a male one.