When I was 4 y/o my parents separated. M Dad moved out. I felt like my whole world was falling apart around me. I was convinced my parents were divorcing because of me even though they talked to me about it and tried to reassure me that it had nothing to do with me.
When my Dad walked out, I feared that my Mom would be next. It’s not a fear that is easily cured.
Your daughter is only 5. At this age you and Dad are her whole world and now part of that world is gone or she spends time with each of you, but you’re not all together. Her world is falling apart.
This can be huge for a young child, and I know. You just be patient with her, hold her and hug her a lot, kiss her and constantly reassure her that she is loved. It will take time.
My parents told me that they divorced because they just didn’t love each other anymore. That caused more fear in me then anything. To a 4 year old that means they could someday wake up and not love ME anymore.
Best of luck with your precious daughter. Be there for her now as much as you can because they grow up so fast!