You do a lot better in English than I do in my second language (Spanish).

Please let me know if you want me to say something differently or it was hard to understand.
The "right" term is what she wants, but it sounds like she doesn't know that yet, which is common early on.
Talking to a doctor is a good idea. She'll probably be OK, most people are, but you can tell her that my wife would have died if she'd tried hormones without a doctor. It sounds like she's desperate to make progress now that she's started, which is understandable, but it's so hard on you and people around her.
I was the same way, but thinking too much about the future can drive you crazy. People might see you as a lesbian, yes, but by then you might be all right with it.
I remember how hard it was when I couldn't talk about anything with her, and it seemed like nobody else understood. There are people here who know what it's like, and eventually you're right that you *will* be able to talk to and depend on her again.
If she hasn't left you for another woman before now, she probably won't because of this - from what you say, she does know how lucky she is to have you. It's very, very hard to date as a trans person; that's kind of a cruel reassurance, but it's true that she'll have more trouble finding someone else (if she even wants to, and it seems like she doesn't) as a trans woman than as a man. The most important part is that you both love each other and want to find a way through this together. Most couples who feel that way do stay together, and you're certainly doing your best for her.