So why didn't she phone the police there and then---------as you would ?
You know the answers.
She could not dial out from the phone.
Lewisham is not the sort of place to go out to look for phone boxes at that time.
She had no idea what was happening.
Jeremy said 'everything is going well'
It was not her family. Not her problem.
Jeremy had not asked her to call the police.
If the police were needed, Jeremy would have called them himself.