I feel Roberta Ainstein is not convincing

Roberta Ainstein as Sound Designer has some moments that stayed in my mind. I do not hate it, but it did not pull me into the story. The role needs more detail, but the performance stays on the surface. Many moments pass very fast, and I do not remember much after them. Some emotions are too simple, and I cannot believe the character enough. I remember both the good parts and the parts that did not work so well.