She will not be able to move the mirror, curiously, but she'll be able to rattle it around a bit. She will find that whatever she does to the mirror it seems to reflect that effect back on her. Does Wanda like her brain being rattled? It is sure going to feel like that's happening. Once she stops, she'll find that she's not actually injured/concussed. Just heavily disoriented for a bit. The off sense gets a little stronger when it's rattling her back, but nothing else happens, otherwise.