For anyone who follows the science community, she's been battling Long Covid.
This made me the happiest I've been in the last month to see her back, and more than that still talking about the science! Tell all your nerdy friends and family and so on, and so on.
I tried blinking to YouTube, but apparently the mods take a automatic exception to that. So if you can, please check out her channel again and resubscribe if you followed her before, or if you didn't follow her before and you love science.