Just ask. The worse that could happen is that she says no and I don't know why she would.

Have you thought about what it would be nice to hear her say? Maybe you could write a brief script. Something positive like
"Hello, Cinnamon, You are a wonderful person, You're going to be fine. " etc. This might be a great practice just to write something brief, and basically positive about yourself as a step towards your own self-affirmation.

ETA: My T once did some breathing exercises with me where she counted to help me pace myself. It just occurred to me that would be a great thing to have recorded; a meditation breathing exercise that I could keep with me when I need to do it at home. You might consider something like that.