What if you put her first before shifting or scaling the overlay? Also can you send the screen shot of your preview so that I understand what the problem is more clearly?
INT. BATH - DAY with MIRROR to 0.624 1 344 at layer 3 with MIRROROVERLAY to 1 -27 -2 at layer 2
&GEM1 spot 1.135 159 126 AND GEM1 faces right AND GEM1 moves to layer 1
&GEM spot 1.135 159 126 AND GEM moves to layer 4