Hi @Rodders
Welcome to the forum although as ever we are sorry that you have had cause 
@Sma1512 has been battling very similar problems in some regards to the ones that you’re asking for help with so may be a step or three ahead of you
See their post
The suggestion of talking to citizens advice was a good one. I was going to suggest a stroke association but I see that you’ve tried them and not had very much help
The British consulate where she lives / or the foreign office helpline might be another port of call
Unfortunately you ask a not commonly needed question so we don’t have a ready made historical archive of answers .
If you get stuck after following these suggestions then shout again and I for one will put the thinking cap on and do a few searches
Ciao
Simon