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JLR - I think Monic's right that you have to look after yourself, keep yourself safe. So whatever you choose to do, my version of that would be that it won't help her if you put yourself in a situation where you could be harmed.
Only you know what is or isn't possible in terms of dropping into the shop, but reading what Monic said, I now feel less positive about it as an option.
I am biased in this respect. I don't want to go into too many details, but many years ago, I went to police with concerns about the activities of a local criminal gang, giving them a list of names, house numbers and telephone numbers of others who wanted also to speak to them. (We'd held a meeting.)
The police didn't interview us, they just tipped off the nasties and I was driven out of my home, selling it at a loss in a property crash. It cost me my sanity, my career etc. If I still owned that house, the increase in value by now would be over £200,000.
I don't say don't try to look after others, but having read Monic's wise post, I echo the view that you should look after yourself.