There isn't a chance of such an action being successful ot even being started, there is no duty on members of the public to report crimes also Miss "A" could not be expected to have reasonable grounds to be sure the offence would be repeated in the future and so could not be held responsible for the offender's actions.

Plus reporting it would be no guarantee the offence would not be repeated.

If I see a motorist jump a red light and do not report it, I cannot be held responsible if in the future they do it again and cause an accident.