Yeah there are some surprisingly callous responses in this thread given it's 2018 and all we know about mental illness.
Unfortunately, I think the best option you may need to consider is just staying out of her way and distancing yourself the maximum amount you can. Visiting, texting, and talking on the phone with her won't help - it's just too limited an interaction compared to the time she's putting into immersing herself in the internet. You can't counteract it.
Sadly, there aren't any tools I'm aware of for you to employ here. Preserve your own sanity for struggles in your life you can make a difference with and hopefully she'll come around at some point. You can try to have her committed, but she needs to be way more far gone than this so you're not at that point. There are no other ways to intervene using the medical system.
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