She's always credited in the writers department, but never next to the respective/individual song as a featured artist, to my surprise, which I've never understand why.
At this point, she's collaborated with Em, what, 4-5 songs roughly now? You would think at this point that she would be a featured artist, instead of just solely credited in the writers part. She's an amazing singer btw. Any ideas as to why? Just something to ponder.