Pokimane wants to take a break from Twitch and post on other forms of social media as a replacement to that. She probably has figured that other forms are more simpler to post on and less time consuming and probably just as lucrative if not more as compared to twitter.
As Twitch does require streamers to stay put and keep on live streaming for numerous hours in a day. Some streamers even go for 24 hours streams with sleeping in front of the camera as well. Twitch is quite a high demanding career if you ask me.