Coupled by the fact that Dina told Ellie it was over if she leaves, it seems pretty clear that Dina packed up and left after Ellie made her decision.

Are Ellie and Dina together?

However, after killing Nora, Ellie expressed that she did not want to lose Dina, displaying their relationship remained strong. Their love for each other was further strengthened after their departure from Seattle when they moved into their farm with JJ.

Does Ellie meet Dina get back together?

She's already reconnected with Dina and the baby back in Jackson, and her wearing the bracelet shows that they've made amends. Ellie returns to the farmhouse to get the guitar—notice that she doesn't seem surprised the house is empty or even call out Dina's name.