Might be leaving WWE #3: Bayley

Bayley was part of the Women's Evolution movement from the get go. She, along with Charlotte Flair, Sasha Banks, and Becky Lynch are the Four Horsewomen of NXT. Through their in ring ability and charisma, the four women were able to make women's wrestling more than an afterthought, but a major attraction.
Bayley reigned as NXT champion before losing the belt to Asuka and being elevated to the main roster. She often seems to be overlooked in favour of more glamorous wrestlers like Alexa Bliss or larger wrestlers like Nia Jax.
Bayley and Sasha Banks seemed set to have a long reign as the first WWE women's tag team champions, but then they lost their belts to the IIconics at Wrestlemania 35.
Why she might be leaving the WWE: Bayley is said to be frustrated with her role in the company, though there are no signs she has actually requested a release from WWE. But given her close friendship with Sasha Banks, a case could be made that she might change her mind.