"Anonymous. When you were first taught how to stand. The ladies right arm was as much of a right angle as the man's left."
Absoltuely not. That would be a quite impractical hold. The lady's elbow is much more obtuse while the mans is much more acute.
"The lady moves to the side and what do we have. No change, I don't think so."
The lady has moved a very small distance. But the position of the hands can very by a large distance. Thus it can easily resotore any desired elbow angle - an outragous one as your propose above, or more reasonably a proper one, which is a gracefully obtuse angle of the lady's arm.
"Have a good look and tell me with Hazel's right arm is it 45 degrees. is it 90 degrees or somewhere in between."
It's probably somewhere around 145 degrees. Which is to say, it is definitely bent, but at a graceful angle much more obtuse than that of the man's, as she is most certainly offset from him. Only if he lets his left hand get too far from his body would her elbow actually be straight - if he keeps it in a reasonably position, her elbow will have the nice kind of angle that hazel consistently demonstrates, and alessia gets when mirko isn't distracted and neglecting his hand position.