Am I M31 a rebound, or is she F39 still emotionally attached to her ex?

Hi, I’m 31M. I started talking to a 39F last November. She finalized her divorce in July after a long marriage. We’ve had good conversations and are planning to meet in March. I’m looking for general advice from people who have dated someone recently divorced. What are some common emotional patterns people go through after a long-term marriage ends? What are healthy boundaries and expectations when getting to know someone in this stage of life? What are green flags vs red flags that suggest emotional readiness for a new relationship? I want to approach this situation in a mature and respectful way, while also being mindful of my own emotional well-being. Any advice or experience is appreciated. Thank you.