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her diet has been shit tier so makes sense that she might take over a week to recover. Been there.
She also might not want to make any "should be back by x" tweets and give false hope, and only reach back out when she's 100% feeling better and knows when she's going to be able to stream again.
Clearly they don't want to disclose dire personal life shit/tragedies. Sana taking 2 weeks off because her "dog died" should already tell you that.