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Men Harassed A Woman In A Driverless Waymo, Trapping Her In Traffic
(www.404media.co)
This is a most excellent place for technology news and articles.
It sounds like Waymo were already aware of the situation, in fact they called her in the vehicle as it was happening.
Not to say this isn't a good suggestion, but they seem to have other systems in place that worked.
It worked, only because these men were only being creepy sexist pieces of shit and didn't have worse intentions. Customer support according to this article has no control over the vehicle other than restarting the auto driving routines to make the car move again.