She is doing a series for Hulu.

https://www.yahoo.com/entertainment/greys-anatomy-star-ellen-pompeo-192129716.html

I'm not too broken up about it; her character is either about her boyfriends who i don't care about or her kids, who I really don't care about!!!!

Grey's Anatomy: Who Could Replace Meredith As Main Character? (https://screenrant.com/greys-anatomy-meredith-best-replacements/)

Meredith Grey has long been synonymous with Grey's Anatomy, but season 18 showed she still wants to leave Grey Sloan. Here's who could replace her.