You want to project that you are interest in her and at the same time NOT needy. Direct the conversation and make it all about her. Soooo maybe next phone call.....
You: "Hi, How are you?"
If she answers "Fine" Listen to her voice You: " you sound " happy,sad,tired,angry......
When it gets quiet, YOU end the conversation. "It was nice talking with you! Have a great day and I will talk to you soon"
Just be in the moment and don't second guess yourself. You are doing to best you can with what you know. Every conversation with her will be an opportunity to test things and learn. Do more of what works and stop doing what doesn't work.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712