Is Orihime an Espada?

I was watching Bleach episodes 165 and 166, where Ichigo and Grimmjow have their BIG fight, and something struck me as odd. Grimmjow implies that, although Orihime is "physically unharmed", that there is inner damage, and a split-second clip is shown of Orihime engulfed in a blue-ish/white-ish light... Is there a possibility Aizen "experimented" on her? Can anyone shed a little light on this?