[To say she's shocked is an understatement-- not necessarily for what she's seeing, but that she's seeing Sebastian's memories. In fact, for the first few moments of the memories laying out, she's confused if only because she can't immediately place what memory of hers she's witnessing.
Once it's clear it's Sebastian she's-- just watching. She doesn't particularly seem shocked or disgusted or devastated by what she's seeing. On the contrary, she looks curious, or as if something... well, suddenly makes sense. (Sorry Sebastian, there was always something different about you.)]