She did seem different in the picture emerging from Chelsea's apartment, full of vim, vigor and charm.
However, it can be explained in a less far out way. She recovered, was given medication and had her undercover garments temporarily removed.
Other leaders with body doubles used them in long distance situations ... on a balcony or in a motorcade.
I just don't believe they would risk using a double in a situation like that. But I like it... so prove it to me.