I wonder. Her left shoulder is also relaxed and her body posture is open, not in defense or fighting mode.
The kiss was a spontaneous action in a different era. And her body language definitely makes it seem that what she said years later about the incident doesn’t match what was happening at the time. Jmo
If she'd been terrified or offended she'd have kicked him in the shins and with those solid shoes, he'd have felt it!