>>>she does not have to worry about any shortfall in NI contributions - yes?
and
>>>Also will her husband's income ( pension or otherwise ) affect things?
They're not easy to answer because the whole system is changing anyway! By the time your friend gets to State Pension age, the State Pension will have gone up from £113.10 per week (at the current level) to at least £148.40 per week (which applies from 6 April 2016 but with the actual figure not being set until next autumn). That's largely to give all pensioners something of what many (but not all) currently receive as a 'top up' by way of Pension Credit. There has been no announcement that Pension Credit will then disappear but it''s still possible that there may be changes to the way that it works.
Your friend needs to read this
https://www.gov.uk/new-state-pension
and, I suggest, make some voluntary NI contributions BEFORE APRIL 2016.