She is laying horizontally and not standing vertically.  I wonder how she was able to have blood rush from her head in that position to pass out.  But hey, never underestimate the power of a good finger fuck lol.

I've seen it happen once... an ex-girlfriend passed out briefly after a very extended orgasm.  I don't know whether it would happen that bad but I believe you can pass out.

The only thing that made any sense was that she was more like "Reagan" in the The Exocist than someone who really got off. I've seen some pretty intense Os but that was annoying.