Kathleen's brother passed away six months ago. recently, kathleen has been imagining herself having conversations with her brother as if he were still alive. what phase of bereavement is she most likely experiencing?

I believe the answer is: Separation

During the separation phase, the people who loss their loved one still fully accept the fact that their current situation. In this period, their mind would often create a coping mechanism to alleviate the emotional pain that they felt (which might explain why she's thinking that she's talking to her lost brother)