Asalamu Alaykum Wa Rahmatullahi Wa Barakatuh as I am knowing my potential wife over the phone with the wali am I allowed to say that I love her for her modesty and shyness over the phone to express my feelings BarakAllah Feek, may Allah reward you for the things you do

She is still a stranger to you until the contract, so the talk stays on what you need in order to decide, and the wali's presence removes the seclusion but it does not widen what may be said. Tell the wali that you are pleased with her and want to move forward, and leave the rest for after the contract.