I haven't a clue what to do at this point.
I suspect one of the reasons your daughter doesn't want a real job or obligations is to have more time online in tranny groups/general fucking off, and also to avoid being around people who might question her. Volunteering may be an excuse to meet up with certain people because volunteer work is not a serious and easily confirmed obligation at all.
When you talk, there is going to be a lot of temptation to argue and point out what is obviously wrong to you, but most likely she's already been heavily soaked in counter-arguments to that stuff, from propaganda and shit online. The best move right now is to side step those conversations if you can, and focus on getting her
away from the Internet on a daily basis. Whoever is enabling her behavior is the real enemy. In theory, if you can get her off whatever bullshit group she is in and into a healthy routine, she will forget a lot of this drama and start to focus on more productive and healthy goals. people are most likely putting ideas in her head or just telling her what she wants to hear.
When you're in a tough situation with a person who is stubborn and mentally unstable, sometimes a good way to build a bridge is to ask them
why they are doing something, and ask what they think they need to get over it, in a non-hostile way. Try to figure out with them what the perceived road block is. And just listen. You're going to hear a lot of bullshit and excuses, but valuable information as well that may clue you in to some of what's going on. Less talk, more listening is key, let her blab.
It's also very important to "force" her to simply hear herself talk and justify it or explain what she thinks reality is. (Or at least hear what she want you to believe, because she won't always tell the truth.) She will argue with herself in real time. You may catch her in a lie but you don't want to call it out every time it happens. At the very least it gets her talking to you, and, hopefully, can reduce her perception of any hostility from you.
It may also make sense to ask questions like "What are your plans, what do you see yourself doing, who do you see yourself with in the future" etc. Long term planning questions. Because it's very likely she does not think about it or, if she does, her plans are delusional. She may admit her plans are even impossible because other people won't do what she wants to treat her like a "real man".
The key thing is NOT picking apart what she is saying, but rather leading her down a path where she has to explain herself and think it through. You will probably come up against a lot of frustration somewhere in this, and hear "I don't know what I'm going to do" and such. She may have some breakdowns as she realizes that she has no idea what she's doing. Which may lead to more opportunities to ask questions like "why do you want to do this/what do you think will happen/how can we fix this?" so on. Getting to the point she can honestly admit that she may be forever alone as a trans man is not gonna be easy. Just approach it from the side as much as possible, calling it out directly will most likely lead to screaming.
it really is hard. But when you're trying to bring a person down from a dangerous spot, it's very crucial to not "impose" on them directly what you want done, you will want to rush but don't, you will want to say she is killing herself but this will scare her if it is not the right time to say so. You have to very carefully approach it from the side and take small gains in trust where you can get them.
Right now the most important thing is not even really getting her to admit transition will be harmful or anything, the MOST important thing should be
distracting her from whatever is feeding this addiction.
Get her to focus on any activity during the day that breaks up whatever toxic routine she may have with whoever is grooming her, this also gives her less of an excuse to run away from home again.
Getting new hobbies, making art, getting a small pet, going out for activities, watching movies, anything to take up time and hopefully also encourage her to get an actual job and off of the Internet. It will probably not be easy if you are trying to get her to spend more time with you at first, she may suspect you, but the important thing is just doing stuff for the sake of doing anything that's not online or with strangers.