You're welcome is about loss, love and acceptance. Love is constantly and forever changing. It invokes different feeling, it effects everyone differently. Sometimes it is all consuming, other times it can be fleeting but, when that love changes or you lose it. You experience almost a sense of loss, and to continue living, or continuing on with your life. You must first learn to accept it, accept loss.
You're welcome is the Sharnice's way of journeying through these feelings, and sharing how it changed her.
So before you have time to thank her for sharing her journey with you, she's already said, you're welcome.