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So many things went the right way with this incident.

1. Your wife was aware of her surroundings.
2. You've had a discussion of what to do in such a situation.
3. She remembered what to do.
4. The police were able to respond and did.

Unfortunately, sometimes it takes something like this to happen to expose someone or wake and individual up to their vulnerabilities. Sounds like she's taken a reasonable step in case something like this ever happens again. If it ever does happen again, hopefully, it will end the same way and she won't be forced to take it to the next level.