Hayley posted this on twitter. She is out on Y&R, as the role is being recast.

I’m sad to say I’ll be leaving the Young and the Restless, as my character Abby is being aged to her 20’s. I am so thankful to have had this extraordinary experience, and will always cherish the incredible friends I’ve made. I wish Marcy Rylan the best of luck, I know she’ll make the perfect Abby.