Impossible request!

Put an ad in the local paper using their maiden names , you might be lucky

or as "Long lost Families " to have a go

Yours magazine has a page for people who are looking for long lost friends/relatives. Might be worth a try.

There's a column in the Mail on Saturdays where the track people down - you could write to them.

If you're on Facebook, see if there's a page called Memories of (town/area they lived in) and join it. Then post an appeal for anyone who may know this person asking them to contact you by private message.

Why not try one of those? Send your Mum a holding message saying it may not be possible but you’ll try and not to expect a quick response. Whatever the outcome I suspect you’ll feel better if you’re honest with her, trying one of the suggested routes wouldn’t take huge amounts of time. The suggestions made to you may just have encouraged me to finally try to trace one of my bridesmaids. Last contact 49 years ago. No idea why I’d like to try. I just would .

Employ professional family historians to do it.

Sadly. like it or not, the answer is likely to be that she has died.

Good advice cornergran

The Salvation Army have a tracing service. Very affordable £49 (I think)
Google it and the site gives you all the info on how to go about it.
It's much cheaper than any other way and very secure.

Do your very best and let her know the outcome of every avenue. If her mind is still pretty good she will enjoy hearing about your efforts. Good Luck Sunseeker.

Our village has a 'Spotted' page on fb, maybe the area where your Mum's friend lived has one too.

It may be worth trying to find a marriage on FreeBMD. You could search with a wide date range. Some areas are transcribed up until the early 90's.