I have a theory, I bet she sat there instead, and watched the attention she was getting this whole time when she was "gone" a whole day. When she thinks she had enough attention, she finally posts that she's back, when she was probably sitting there watching people getting worried about her rather than doing something about her mental health.
I have high doubts she was taking a break off twitter. No point in helping someone who doesn't want help. She only wants attention.