Hopefully she's in good spirits & kept comfortable and has some quality of life for whatever quantity remains.
It's a fairly normal reaction for someone to freak out a little at this sort of news, especially people on the spectrum. It's also normal to not be sure how to react or act or what to show in terms of emotions - and there are no rules, guidelines, or expectations really.. since everyone deals with these things differently. I don't think you should fear showing your emotions to your parents/grandparents etc if you're feeling them.. they'll understand. They might find it a bit peculiar if you Didn't show emotions, really. But they'd also probably understand that, too, especially if they're all well aware that you're on the spectrum and that people on the spectrum don't always display the emotions they're feeling.
I don't mean this in any sort of age-ist way, but: You're 16. That's a huge part of why this is so overwhelming and intense for you. Age, lack of life experience, hormones, college life & academic pressures etc etc add it all up and add in the first time you're likely dealing with something like this in your life and Boom, it hits ya like a tonne of bricks. That's normal. You'll get through it. In time you'll experience other bad news and eventual losses of family/friends.. because it's the cycle of life. People grow old, get ill, eventually pass away. This is just one of the first times in your young life that you're dealing with it. It never gets less sad to hear difficult news or accept someone's passing, but it does get easier to process and deal with in time.. with age & experience it's not quite so difficult to deal with. It's not easy or fun, but as you mature your capacity to process these sort of life events will increase & improve and you'll navigate them ever better. Kinda wish I didn't know this to be fact, but at 41 years old now and after losing a lot of family, friends, and acquaintances, it's simply something I've come to know to be true.
_________________
No
for supporting trump. Because doing so is deplorable.