I don't really follow bloggers, so I'm honestly not up to date on Kira Plastinina. I know she's a figure in the media, but I'm not used to keeping up with her activities. To be honest, I rarely see news about popular people in general - I usually find out by chance when something pops up in my feed or friends are talking about it.
From what I gathered from your question, she kind of disappeared from the media and people were wondering what happened to her. But I don't know anything specific about her situation. If you want to find out the details, here's my advice - try searching on Kira's own social media or news websites, that's where they usually write about these kinds of stories. You'll get information firsthand rather than just guessing.
Maybe she just decided to take a break from the internet? A lot of bloggers do that - they burn out from all the constant attention and just disappear for a while. Or maybe something personal happened. Either way, if she's not talking about it herself, you won't really know what actually went down.