Having moved many times , both here and abroad, my tips are these. Whilst it would be good to visit at any time, and make a note of any areas , that you like the look of, I would suggest that she goes in something like October/November and stays for a few days in a B/B.
That allows you to see the place outside holiday times, go to the library and look up what clubs and facilities are open and check on the public transport etc. If it is a decent B/B the owner will probably know the area quite well and could give you tips and ideas about the area. Then in the future if she does actually move there, she could book a nights b/b there on the moving day. I have often done that , as it is good to know you can go to a clean bed and somewhere to relax, rather than having to push yourself sorting beds out first thing, and if there is any delay or problems you can lock the door and come back to it fresh the following day.
If she is going to have a look in the near future, then I would also go to a newsagent and get the local paper and see if she can get it sent to her at home each week or whatever. I think that is always a very worthwhile thing to do. You read all about what is going on there, and if it has houses in , get an idea of price range. Also something over time is, if you read about any problems such as a lot of noise or late night hassles anywhere, (which I hasten to add is unlikely) and notices about roadworks or comments in letters about any changes to bus timetables etc etc. It lets you build up a realistic idea of life in a new place and then when you go to stay there in a quieter time, with no festivities giving you a misleading impression, you have already got lots of information. You can also look up clubs and societies in the library and if you are a gardener for instance, you could make contact with the gardening club and get some idea of where you might find the best area for gardens.
We naturally have rose coloured views of new places , which can be very pleasant, but trying places out on an everyday basis is worth the expense, and can also be very reassuring ,especially if you are moving on your own, and I think we all get those doubts, when we have committed ourselves and signed on the dotted line. Also if you do something like this, you might find the prices higher than you expected or whatever and you could also do a little exploring and check out other places like Corbridge.
It can also be worthwhile to write out a couple of lists. One of the things you enjoy or are important to you, and without being pessimistic consider the future and maybe have less of a garden or think about any steps or how easy it is to get in and out of somewhere, so that you find a place that you will be able to stay for a long time The other is to think about anything you dislike about where you live now, or would dislike in a new place, and put that down too, to check up against when you are househunting. So for example I have always looked to see if there are two ways out from wherever I live. It has been useful, when there have been roadworks or big queues or any crashes or any hold ups, that I have another way out.
Lastly the bit that many people dont check up on. When you find a possible place, you may have a lovely view , but you dont own the view, and it is worth checking up if there is likely to be buildings or new roads or anything that might change things a great deal. If you happen to see a town map in a charity shop , snap it up. Then when you are in Hexham you can highlight any area that you like the look of, and as you wander around you can have a couple of different coloured biros or whatever and note the streets that have a lot of traffic or another colour for quieter places.Perhaps yellow highlight any roads that you like the look of, so that when you are back at home, and you see a property for sale, you can look up the address on your map and see what your comments , ideas on that street were.
I hope that some of these ideas are helpful and you can choose to see it as a win/win situation. If after looking around you dont think it is a suitable move for you, then you may look for somewhere much closer to your old home, so that you might find a quieter town but with easy possibility to get back to visit old friends and places.