https://www.youtube.com/watch?v=TmrCvhxyR1w
Poof starts at the 7:00 mark of the video.
Super Planet Dolan is a trivia video series that provides entertainment with Dolan and his partner answering Trivia questions but only his partner provides the actual answers that are being read, Dolan on the other hand gives out "TRUTH" i.e. completely made up stuff. Recently he has an additional partner named Melissa who takes his main partner's place, Shima, when she isn't available. In this video in one of his TRUTHs, he claims that a deadly disease is the reason why Melissa is a bird girl... before poofing into a bird man shortly after.
Since then, it seems like it's really true that Melissa was a former human in one of the later videos Dolan asks how she grew her tail, she describes it was painful.
https://www.youtube.com/watch?v=IeEhWmxiOx4
There's a partial poof in the latest video during question 9 where Melissa provides the actual answer to it at 1:22 Melissa suddenly became human and stayed that way until Dolan points out her feet which were bird feet. And then she wakes up... and finds that she has human feet... and then she wakes up for real.