This completely depends on the personality type of the woman. I expect in most cases she would be disappointed in the outcome. The exception is if she is the muscular girl in question. Then I would expect her to be proud of herself.
Depends on what sort of relationship you have. If it's more modern she'd probably just point and laugh. If it's more traditional she probably be more sad and worried.
Where ist the problem ???
The only problem is when the man make it to a problem
My man dont get beaten often at atmwrestle womean but when he respect her athletic performance so everything is fine .
For me most be proud of both because i know about the sport and how to measure
She will be sad because her boyfriend was beaten by a GIRL