I feel Tatyana Shitova is not convincing

For me, Tatyana Shitova's work in Sheep & Wolves (2016) is easy to talk about after watching. Some emotions are too simple, and I cannot believe the character enough. Many moments pass very fast, and I do not remember much after them. The role needs more detail, but the performance stays on the surface. For me, it does not feel very real in many scenes. I do not hate it, but it did not pull me into the story. This is only my personal view, but the performance changed how I enjoyed the film.