This:
https://www.moneyhelper.org.uk/en/family-and-care/divorce-and-separation/state-pension-and-divorce-dissolution#:~:text=Your%20basic%20State%20PensionOpens,Pension%20the%20other%20person%20gets.
says:
"However, divorced couples can use their former spouse or civil partner’s National Insurance contributions to increase their basic State Pension. This won’t reduce the amount of State Pension the other person gets." It appears there is a difference depending upon whether one reached state pension age before 6 April 2016. She did, I didn't as she's a good few years older than me.
Steve Webb was the Pensions Minister when all the changes came in for the New State Pension. He wrote/writes a lot of articles.
From what he has written in this article about divorce, it is to do with the married womens stamp, when (bizarre as it may sound) they chose to pay less for their stamps (NICs) to get more in their wage packet, in return for a lower State Pension on retirement. They would then claim a higher SP based on their husband's contributions when he retired, but still not a full state pension. But some divorced before they reached their UK SP age and for those who reached UK retirement age before 6 April 2016, they could use their ex husband's QY record for when they were married, to increase her SP (as long as she didn't remarry before she reached UK SP age).
This article of his on divorce; under the old SP and the New SP; is worth a read.
https://www.thisismoney.co.uk/money/pensions/article-3743029/I-divorced-state-pension-lose-remarry-Steve-Webb-replies.htmlYou can find other articles of his on the State Pension.
She should be checking her NICs record on the link I gave in my first post, to make sure it is correct. Then contact the DWP to see if she can have a: albeit small; UK State pension.
For a few short years of madness, people only needed one qualifying year for a tiny SP, before it was moved back to a minimum of 10 years for a small SP.
EDIT According this gov.uk link, the Married Womans Stamp ended for new entrants in April 1977.
https://www.gov.uk/reduced-national-insurance-married-women