Sorry to add more,but the fact that she HAS a husband (who I assume she is still married to?) will count against her.
UK Immigration will want to know WHY she wants to return but her husband does not.
They will also want to know why her husband cannot finance her when she returns,this may sound crazy but it's the way the Immigration rules work.
They will be working on the idea that she should have made financial provision for her return to the UK,OR that her husband should be providing finance.If they had both returned (of course he may not be a UK person) it might be different.
Immigration are (in their minds) going to see something suspicious as to WHY she wants to return when she is still married,and maybe even has property in SA.
These are not MY ideas,but I know how these officials minds work.
As you can see,FIRST she has to get into the country (to stay that is) just because she has joint passports doesn't give her automatic status,especially after 34 years.SECOND,she has to finance herself while being here.
That is money to live on,money for rent.
You don't say how old she is,but I guess 54ish.Jobs for UK citizens with experience are hard enough to come by in a recession;jobs for incoming (maybe) unexperienced mature persons are practically non~existent.
Not only that but she will not qualify for a UK State Pension, so (like our friends) she may have to go on working till she drops.
I really am sorry to be such a wet blanket,but I feel from is jumping out of the frying pan into the fire.
She may have few friends in SA,but at least she knows the country,I cannot think it would be the same here.
Is there any possibily that she could get one of her UK friends to accomodate her,just till she gets on her feet;at least that would be a start.
Just impress on her that the UK she knew(in 1975) is NOT the UK WE know.
As I said before I hope (with a friend like you) that