Hiya tbunny, I am glad you are here sharing.
I should say, because of the subjects discussed, I have needed to use mixed pronouns, but I think I kinda had to, in order to explain my point. Anyways...
imagine you woke up one day, look in the mirror and saw a man. A hairy, muscly man, with man features. You walk downstairs and everyone else thinks it normal but you feel like you are pretending to be what they expect. Would you say, 'meh, I suppose I will just be a girly man' or would you put it right? I am guessing that, if you are like me, the use of words like 'he' and 'his' used about you, would make you silently cringe. I think that's why she can't just be a femme boy. Believe me, I was that femme boy, but it isn't enough, because its not *right* and you can only hide yourself for so long until it takes its toll on you. Its best not to ask her to be anything other than who she is. :-)
A caring mother such as you with your desire to understand, will figure that out though. :-)
I never understood the 'loss of a son/daughter' idea. I am kinda guessing here but I can only imagine that it is based on the desire to have a 'typical boy', and the change in expectations of what they would do with their life. But that's odd as I bet 'he' could have changed those expectations without transition and you wouldn't have mourned the loss of 'him'. If 'he' had grown up to be that femme boy, basically a girls interests, actions, mannerisms, style, personality etc. but without being called 'she', would you have morned the loss of a son, because he didn't want to play football and do boy things? No, I doubt it very much. He would be your son regardless of what his preferences were. You wouldn't have lost a son, you would just have found out that he was different from most other boys, and that isn't a bad thing.
Take that same situation and add in the name and pronoun change. She, hers, etc. Does that steal your 'son' away; just the word change? No it doesn't. I could have a child and call them any words I like, but my feelings remain the same for them.
I suppose I am trying to say that I am guessing that you are not mourning the loss of a son, actually you are morning your the loss of your expectations of what your child would do with their life and that really could easily have been the same, whether your child transitioned or not. They could quite easily have taken so many paths that weren't what you had in mind for them and normally do, so try not to attribute that to transition. I think this is the same for others but, transition actually changed little about me, except how I looked, the words people used to address me and how happy I am. Other than that, I remain the same I think.
What do I know though hey? :-)
I bet if you would address your daughter as her, it would make her so happy, getting a token of support, which is a big deal as transitioning is really really scary and it can often feel like nobody will accept you! I know I would love it if my family would address me properly, but they would have to start talking to me again first!
Good luck with everything :-)
Akira x