How can I support my girlfriend better?

My (Afab, she/they) partner (mtf, she/her, not on HRT yet) and I just started dating a few weeks ago. I’ve always been very comfortable and aware of her being trans and queer from the beginning of our friendship. I’ve never had a problem with any of this before, but recently I’ve been more inquisitive about her identity and her plans for transitions.

I felt a sort of discomfort and anxiety regarding it. Mostly (I later realized), because for me I don’t really think of anyone in the context or to be defined by gender, I see people as people and the interests they have/ character traits. Gender only really comes up in my mind when I’m asked about someone’s gender then I remember that people have genders. So I think of her as a woman, so I was initially confused on why she would need anything else when to me she already is a woman. But of course it’s but a dysphoria thing that I was stupidly not thinking about. But the other two reasons I’m concerned about it, is because of the risks and her relationship with her family. I make an effort to know about the things that she’s doing and cares about, so I did some research on the meds she’s going to be starting in around a week. And for some reason I’m concerned, Thrombosis, strokes, heart issues, type 2 diabetes, most of these things are uncommon. But I’m constantly stressed about it, maybe it’s just that I don’t want things to change or I’m scared of something going wrong.

I’m just terrified, another piece of it is her father, is not supportive of this at all. And he doesn’t know, I don’t know that she’s going to tell him before she starts medication. She still lives with him, I think there may be something catastrophic will happen if she doesn’t tell him at all. I’m just scared all the time that something is going to happen to her. I communicated this with her and she said that it’s sweet of me to worry about her but she’s not worried about it so I shouldn’t be worried about it either. It’s not as if I don’t support her, I want her to do whatever she needs to in order to feel comfortable and safe within her own body. Whatever she needs to reach that I want her to do.

But I don’t know how to stop this feeling of intense

constant impending doom feeling surrounding her situation, how do I stop it? I just want to support my girlfriend however I can, but I can’t wholeheartedly support her in this when I’m so afraid somethings going to go wrong.