No one has been nasty on this thread. Just realistic about what qualities someone returning to work after long absence needs show to be successful.
Oddly enough getting computer or any other skills before they start is not essential. Nor is being not very confident or being nervous or lacking self esteem an enemy to returning to successful employment. What is important is, that when in an interview, showing an enthusiasm about returning to work and a willingness to learn new things.
The Indeed (an online job agency) has a web site with a whole section on returning to work. It is located at www.indeed.com/career-advice/finding-a-job/reentering-the-workforce-after-a-long-absence
I know the OP does not use the internet, but a first small step might be to sit down with someone they feel comfortable with - a child, grandchild or friend and ask them to access this site and explain how they did it and then sit and read the site and possibly get their helper to print some of it out so that they can read it off line.
Another step she could take would be to contact her local branch of Age UK. Almost every branch will have computer 'friends' who will be more than willing and more than used to helping older people like biscuitmuncher gain some simple computer skills.
The other thing that she could do, which might help to boost her self esteem, is look at all she has been doing at home during her out of employment years - and see it in term of what are known (and highly regarded) as 'soft skills'. She is used to managing a small enterprise in her home including working to a budget, organising all the different activities required of her to keep make sure children get where they are meant to be when they are meant o be there - and still have supper on the table at the usual time.
Any parent knows how they pick up communication and negotiation skills when dealing with children, husbands, schools, friends, friends parents. All skills needed in the workplace as well.
I think the OP needs to start by building up her confidence through small steps, like finding a way to access the link above througha friend, then talking to someone like Age UK about some gentle friendly client led computer training, then perhaps sit with some one you trust and work out how to interprete your home experience into workplace skills.
But in the end the first step has to lie with her. She has take hold of herself by the back oftheneck, give herself a little shake and make the first step. Once the first step is taken, the second is easier and it gets easier as each small success leads to another.
Remember failure is the one thing everyone experiences, you will have set backs, but just do as everyone else does, pick yourself up, brush yourself down and start all over again.