As a reminder, be sure to properly give content warnings and put sensitive subjects behind proper spoiler tags. It's for the mental health of not just your comrades, but yourself as well.
Here is a screenshot of where to find the spoiler button.
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It's fucked up, but this is an incredibly common reaction from parents. It's not necessarily indicative of where she'll be a year from now.
When I first told my wife, she didn't handle it in a great way (imo). But after some time has passed, we're closer than ever.
I've been talking to my friend from my hometown about transition, and he said "man, I'm sad I never got to say goodbye to [deadname]" and I'm like, "I'm still alive, asshole lmao"
He's 100% supportive, too.
My husband had a similar reaction when I initially told him. Like your situation, we're now so much closer than we've ever been. Hopefully my mom will get there too.