I see what you’re saying, but I think it will be a bit harder for Taiwanese people to be able to tell that a foreigner is trans versus a local. She’s also not going through the process right before their eyes.
In general I think it’s good policy to keep your personal life separate from your professional life, anyway. Even so, most trans people wipe their social media of who they “used to be” so it’s difficult to out them through that.
I really think it’s at least worth a try, and while it might end up not working out, at least she’s not putting herself at risk. Taiwan is one of the safer/more LGBT-friendly places to live and work in Asia. Let OP explore a bit and see for herself.
I do agree about hormones, though. I have no idea how available those are here.