"This isn't the person I married and now I'm sad!" is a legitimate reason to divorce someone, though. That's a statement that can apply to anyone's spouse, cis or trans. "My husband's stopped making an effort with me and spends all his time with his friends at the bar", for example, or "My wife's become rude and confrontational about every little thing". Hell even "My spouse has decided they don't want kids, and that's something that's important to me". Ideally you work through it and see if there's a root issue that needs addressing and resolving, but if you can't resolve it then it's fine to get divorced.
"My husband's decided he's a woman, and is insisting I call him Samantha, and he's going to dress like a stripper and baby talk at all of our friends, and I'm supposed to lick the suppurating wounds that are the remains of his genitals" is not really an issue that can be resolved.
It is
suspicious that at her age she's progressed amazingly, is 6'1" etc. but that
could just be a very masculine woman who's nerdy. She doesn't even post anything to do with LGBT stuff. Her socials all seem pretty new, though. I wonder if-
https://youtube.com/watch?v=P7aZy7EGtSgThere we go.